Adding upstream version 2:9.1.0016.upstream/2%9.1.0016

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 4708 insertions, 0 deletions

diff --git a/src/configure.ac b/src/configure.ac
new file mode 100644
index 0000000..ebe0d08
--- /dev/null
+++ b/src/configure.ac
@@ -0,0 +1,4708 @@
+dnl configure.ac: autoconf script for Vim
+
+dnl Process this file with autoconf 2.71 to produce "configure".
+
+AC_INIT
+AC_CONFIG_SRCDIR([vim.h])
+AC_CONFIG_HEADERS(auto/config.h:config.h.in)
+
+dnl Being able to run configure means the system is Unix (compatible).
+AC_DEFINE(UNIX)
+AC_PROG_MAKE_SET
+
+dnl Checks for programs.
+AC_PROG_CC		dnl required by almost everything
+AC_PROG_CPP		dnl required by header file checks
+AC_PROG_EGREP		dnl required by AC_EGREP_CPP
+AC_PROG_FGREP		dnl finds working grep -F
+AC_PROG_AWK		dnl required for "make html" in ../doc
+
+dnl Don't strip if we don't have it
+AC_CHECK_PROG(STRIP, strip, strip, :)
+
+dnl Check for extension of executables
+AC_EXEEXT
+
+AC_HEADER_SYS_WAIT
+
+dnl Check that the C99 features that Vim uses are supported:
+if test x"$ac_cv_prog_cc_c99" != xno; then
+  dnl If the compiler doesn't explicitly support C99, then check
+  dnl for the specific features Vim uses
+
+  AC_TYPE_LONG_LONG_INT
+  if test "$ac_cv_type_long_long_int" = no; then
+    AC_MSG_FAILURE([Compiler does not support long long int])
+  fi
+
+  AC_MSG_CHECKING([if the compiler supports trailing commas])
+  trailing_commas=no
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
+    enum {
+      one,
+    };])],
+    [AC_MSG_RESULT(yes); trailing_commas=yes],
+    [AC_MSG_RESULT(no)])
+  if test "$trailing_commas" = no; then
+    AC_MSG_FAILURE([Compiler does not support trailing comma in enum])
+  fi
+
+  AC_MSG_CHECKING([if the compiler supports C++ comments])
+  slash_comments=no
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],
+    [// C++ comments?])],
+    [AC_MSG_RESULT(yes); slash_comments=yes],
+    [AC_MSG_RESULT(no)])
+  if test "$slash_comments" = no; then
+    AC_MSG_FAILURE([Compiler does not support C++ comments])
+  fi
+fi
+
+dnl If $SOURCE_DATE_EPOCH is present in the environment, use that as the
+dnl "compiled" timestamp in :version's output.  Attempt to get the formatted
+dnl date using GNU date syntax, BSD date syntax, and finally falling back to
+dnl just using the current time.
+if test -n "$SOURCE_DATE_EPOCH"; then
+  DATE_FMT="%b %d %Y %H:%M:%S"
+  BUILD_DATE=$(LC_ALL=C date -u -d "@$SOURCE_DATE_EPOCH" "+$DATE_FMT" 2>/dev/null || LC_ALL=C date -u -r "$SOURCE_DATE_EPOCH" "+$DATE_FMT" 2>/dev/null || LC_ALL=C date -u "+$DATE_FMT")
+  AC_DEFINE_UNQUOTED(BUILD_DATE, ["$BUILD_DATE"])
+  BUILD_DATE_MSG=-"echo -e '=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=\nNOTE: build date/time is fixed: $BUILD_DATE\n=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-='"
+  AC_SUBST(BUILD_DATE_MSG)
+fi
+
+dnl Check for the flag that fails if stuff are missing.
+
+AC_MSG_CHECKING(--enable-fail-if-missing argument)
+AC_ARG_ENABLE(fail_if_missing,
+	[  --enable-fail-if-missing    Fail if dependencies on additional features
+     specified on the command line are missing.],
+	[fail_if_missing="yes"],
+	[fail_if_missing="no"])
+AC_MSG_RESULT($fail_if_missing)
+
+dnl Keep original value to check later.
+with_x_arg="$with_x"
+
+dnl Set default value for CFLAGS if none is defined or it's empty
+if test -z "$CFLAGS"; then
+  CFLAGS="-O"
+  test "$GCC" = yes && CFLAGS="-O2 -fno-strength-reduce -Wall -Wno-deprecated-declarations"
+fi
+
+if test "$GCC" = yes; then
+  dnl Method that should work for nearly all gcc versions.
+  gccversion=`$CC -dumpversion`
+  if test "x$gccversion" = "x"; then
+    dnl old method; fall-back for when -dumpversion doesn't work
+    gccversion=`$CC --version | sed -e '2,$d' -e 's/darwin.//' -e 's/^[[^0-9]]*\([[0-9]]\.[[0-9.]]*\).*$/\1/g'`
+  fi
+
+  dnl Gcc version 4.0.1 was reported to cause trouble on Macintosh by Marcin
+  dnl Dalecki.  For Mac with Intel the symptom reported is: malloc() reports
+  dnl double free.  This happens in expand_filename(), because the optimizer
+  dnl swaps two blocks of code, both using "repl", that can't be swapped.
+  if test "$gccversion" = "3.0.1" -o "$gccversion" = "3.0.2" -o "$gccversion" = "4.0.1"; then
+    echo 'GCC [[34]].0.[[12]] has a bug in the optimizer, disabling "-O#"'
+    CFLAGS=`echo "$CFLAGS" | sed 's/-O[[23456789]]/-O/'`
+  else
+    if test "$gccversion" = "3.1" -o "$gccversion" = "3.2" -o "$gccversion" = "3.2.1" && `echo "$CFLAGS" | grep -v fno-strength-reduce >/dev/null`; then
+      echo 'GCC 3.1 and 3.2 have a bug in the optimizer, adding "-fno-strength-reduce"'
+      CFLAGS="$CFLAGS -fno-strength-reduce"
+    fi
+  fi
+fi
+
+dnl clang-500.2.75 or around has abandoned -f[no-]strength-reduce and issues a
+dnl warning when that flag is passed to.  Accordingly, adjust CFLAGS based on
+dnl the version number of the clang in use.
+dnl Note that this does not work to get the version of clang 3.1 or 3.2.
+AC_MSG_CHECKING(for clang version)
+CLANG_VERSION_STRING=`$CC --version 2>/dev/null | sed  -n -e 's/^.*clang[[^0-9]]*\([[0-9]][[0-9]]*\.[[0-9]][[0-9]]*\.[[0-9]][[0-9]]*\).*$/\1/p'`
+if test x"$CLANG_VERSION_STRING" != x"" ; then
+  CLANG_MAJOR=`echo "$CLANG_VERSION_STRING" | sed -n -e 's/\([[0-9]][[0-9]]*\)\.[[0-9]][[0-9]]*\.[[0-9]][[0-9]]*/\1/p'`
+  CLANG_MINOR=`echo "$CLANG_VERSION_STRING" | sed -n -e 's/[[0-9]][[0-9]]*\.\([[0-9]][[0-9]]*\)\.[[0-9]][[0-9]]*/\1/p'`
+  CLANG_REVISION=`echo "$CLANG_VERSION_STRING" | sed -n -e 's/[[0-9]][[0-9]]*\.[[0-9]][[0-9]]*\.\([[0-9]][[0-9]]*\)/\1/p'`
+  CLANG_VERSION=`expr $CLANG_MAJOR '*' 1000000 '+' $CLANG_MINOR '*' 1000 '+' $CLANG_REVISION`
+  AC_MSG_RESULT($CLANG_VERSION)
+  dnl If you find the same issue with versions earlier than 500.2.75,
+  dnl change the constant 500002075 below appropriately.  To get the
+  dnl integer corresponding to a version number, refer to the
+  dnl definition of CLANG_VERSION above.
+  dnl Clang 11 reports "11", assume Clang 10 and later work like this.
+  AC_MSG_CHECKING(if clang supports -fno-strength-reduce)
+  if test "$CLANG_MAJOR" -ge 10 -o "$CLANG_VERSION" -ge 500002075 ; then
+    AC_MSG_RESULT(no)
+    CFLAGS=`echo "$CFLAGS" | sed -e 's/-fno-strength-reduce/ /'`
+  else
+    AC_MSG_RESULT(yes)
+  fi
+else
+  AC_MSG_RESULT(N/A)
+fi
+
+dnl If configure thinks we are cross compiling, there might be something
+dnl wrong with the CC or CFLAGS settings, give a useful warning message
+CROSS_COMPILING=
+if test "$cross_compiling" = yes; then
+  AC_MSG_RESULT([cannot compile a simple program; if not cross compiling check CC and CFLAGS])
+  CROSS_COMPILING=1
+fi
+AC_SUBST(CROSS_COMPILING)
+
+dnl gcc-cpp has the wonderful -MM option to produce nicer dependencies.
+dnl But gcc 3.1 changed the meaning!  See near the end.
+test "$GCC" = yes && CPP_MM=M; AC_SUBST(CPP_MM)
+
+if test -f ./toolcheck; then
+  AC_MSG_CHECKING(for buggy tools)
+  sh ./toolcheck 1>&AS_MESSAGE_FD
+fi
+
+OS_EXTRA_SRC=""; OS_EXTRA_OBJ=""
+
+dnl When cross-compiling set $vim_cv_uname_output, $vim_cv_uname_r_output and
+dnl $vim_cv_uname_m_output to the desired value for the target system
+AC_MSG_CHECKING(uname)
+if test "x$vim_cv_uname_output" = "x" ; then
+  vim_cv_uname_output=`(uname) 2>/dev/null`
+  AC_MSG_RESULT($vim_cv_uname_output)
+else
+  AC_MSG_RESULT([$vim_cv_uname_output (cached)])
+fi
+
+AC_MSG_CHECKING(uname -r)
+if test "x$vim_cv_uname_r_output" = "x" ; then
+  vim_cv_uname_r_output=`(uname -r) 2>/dev/null`
+  AC_MSG_RESULT($vim_cv_uname_r_output)
+else
+  AC_MSG_RESULT([$vim_cv_uname_r_output (cached)])
+fi
+
+AC_MSG_CHECKING(uname -m)
+if test "x$vim_cv_uname_m_output" = "x" ; then
+  vim_cv_uname_m_output=`(uname -m) 2>/dev/null`
+  AC_MSG_RESULT($vim_cv_uname_m_output)
+else
+  AC_MSG_RESULT([$vim_cv_uname_m_output (cached)])
+fi
+
+AC_MSG_CHECKING(for Haiku)
+case $vim_cv_uname_output in
+    Haiku) HAIKU=yes; AC_MSG_RESULT(yes);;
+    *)     HAIKU=no; AC_MSG_RESULT(no);;
+esac
+
+dnl If QNX is found, assume we don't want to use Xphoton
+dnl unless it was specifically asked for (--with-x)
+AC_MSG_CHECKING(for QNX)
+case $vim_cv_uname_output in
+    QNX)	OS_EXTRA_SRC=os_qnx.c; OS_EXTRA_OBJ=objects/os_qnx.o
+		test -z "$with_x" && with_x=no
+		QNX=yes; AC_MSG_RESULT(yes);;
+    *)		QNX=no; AC_MSG_RESULT(no);;
+esac
+
+dnl Check for Darwin and MacOS X
+dnl We do a check for MacOS X in the very beginning because there
+dnl are a lot of other things we need to change besides GUI stuff
+AC_MSG_CHECKING([for Darwin (Mac OS X)])
+if test "$vim_cv_uname_output" = Darwin; then
+  AC_MSG_RESULT(yes)
+  MACOS_X=yes
+  CPPFLAGS="$CPPFLAGS -DMACOS_X"
+
+  AC_MSG_CHECKING(--disable-darwin argument)
+  AC_ARG_ENABLE(darwin,
+	  [  --disable-darwin        Disable Darwin (Mac OS X) support.],
+	  , [enable_darwin="yes"])
+  if test "$enable_darwin" = "yes"; then
+    AC_MSG_RESULT(no)
+    AC_MSG_CHECKING(if Darwin files are there)
+    if test -f os_macosx.m; then
+      AC_MSG_RESULT(yes)
+    else
+      AC_MSG_RESULT([no, Darwin support disabled])
+      enable_darwin=no
+    fi
+  else
+    AC_MSG_RESULT([yes, Darwin support excluded])
+  fi
+
+  AC_MSG_CHECKING(--with-mac-arch argument)
+  AC_ARG_WITH(mac-arch, [  --with-mac-arch=ARCH    current, intel, ppc or both],
+	MACARCH="$withval"; AC_MSG_RESULT($MACARCH),
+	MACARCH="current"; AC_MSG_RESULT(defaulting to $MACARCH))
+
+  AC_MSG_CHECKING(--with-developer-dir argument)
+  AC_ARG_WITH(developer-dir, [  --with-developer-dir=PATH    use PATH as location for Xcode developer tools],
+	DEVELOPER_DIR="$withval"; AC_MSG_RESULT($DEVELOPER_DIR),
+        AC_MSG_RESULT(not present))
+
+  if test "x$DEVELOPER_DIR" = "x"; then
+    AC_PATH_PROG(XCODE_SELECT, xcode-select)
+    if test "x$XCODE_SELECT" != "x"; then
+      AC_MSG_CHECKING(for developer dir using xcode-select)
+      DEVELOPER_DIR=`$XCODE_SELECT -print-path`
+      AC_MSG_RESULT([$DEVELOPER_DIR])
+    else
+      DEVELOPER_DIR=/Developer
+    fi
+  fi
+
+  if test "x$MACARCH" = "xboth"; then
+    AC_MSG_CHECKING(for 10.4 universal SDK)
+    dnl There is a terrible inconsistency (but we appear to get away with it):
+    dnl $CFLAGS uses the 10.4u SDK library for the headers, while $CPPFLAGS
+    dnl doesn't, because "gcc -E" doesn't grok it.  That means the configure
+    dnl tests using the preprocessor are actually done with the wrong header
+    dnl files. $LDFLAGS is set at the end, because configure uses it together
+    dnl with $CFLAGS and we can only have one -sysroot argument.
+    save_cppflags="$CPPFLAGS"
+    save_cflags="$CFLAGS"
+    save_ldflags="$LDFLAGS"
+    CFLAGS="$CFLAGS -isysroot $DEVELOPER_DIR/SDKs/MacOSX10.4u.sdk -arch i386 -arch ppc"
+    AC_LINK_IFELSE([AC_LANG_PROGRAM([ ], [ ])],
+	AC_MSG_RESULT(found, will make universal binary),
+
+	AC_MSG_RESULT(not found)
+	CFLAGS="$save_cflags"
+	AC_MSG_CHECKING(if Intel architecture is supported)
+	CPPFLAGS="$CPPFLAGS -arch i386"
+	LDFLAGS="$save_ldflags -arch i386"
+	AC_LINK_IFELSE([AC_LANG_PROGRAM([ ], [ ])],
+	    AC_MSG_RESULT(yes); MACARCH="intel",
+	    AC_MSG_RESULT(no, using PowerPC)
+		MACARCH="ppc"
+		CPPFLAGS="$save_cppflags -arch ppc"
+		LDFLAGS="$save_ldflags -arch ppc"))
+  elif test "x$MACARCH" = "xintel"; then
+    CPPFLAGS="$CPPFLAGS -arch intel"
+    LDFLAGS="$LDFLAGS -arch intel"
+  elif test "x$MACARCH" = "xppc"; then
+    CPPFLAGS="$CPPFLAGS -arch ppc"
+    LDFLAGS="$LDFLAGS -arch ppc"
+  fi
+
+  if test "$enable_darwin" = "yes"; then
+    MACOS_X_DARWIN=yes
+    OS_EXTRA_SRC="os_macosx.m os_mac_conv.c";
+    OS_EXTRA_OBJ="objects/os_macosx.o objects/os_mac_conv.o"
+    dnl os_macosx.m implements timer_create() and friends
+    AC_DEFINE(HAVE_TIMER_CREATE)
+    dnl TODO: use -arch i386 on Intel machines
+    dnl Removed -no-cpp-precomp, only for very old compilers.
+    CPPFLAGS="$CPPFLAGS -DMACOS_X_DARWIN"
+
+     dnl Assume we don't want X11 unless it was specifically asked for
+     dnl (--with-x) or Motif or GTK GUI is used.
+     if test -z "$with_x" -a "X$enable_gui" != Xmotif -a "X$enable_gui" != Xgtk2 -a "X$enable_gui" != Xgtk3; then
+      with_x=no
+     fi
+  fi
+else
+  AC_MSG_RESULT(no)
+fi
+
+dnl Mac OS X 10.9+ no longer include AvailabilityMacros.h in Carbon
+dnl so we need to include it to have access to version macros.
+AC_CHECK_HEADERS(AvailabilityMacros.h)
+# 10.5 and earlier lack dispatch
+AC_CHECK_HEADERS(dispatch/dispatch.h)
+
+AC_SUBST(OS_EXTRA_SRC)
+AC_SUBST(OS_EXTRA_OBJ)
+
+dnl Add /usr/local/lib to $LDFLAGS and /usr/local/include to CFLAGS.
+dnl Only when the directory exists and it wasn't there yet.
+dnl For gcc don't do this when it is already in the default search path.
+dnl Skip all of this when cross-compiling.
+if test "$cross_compiling" = no; then
+  AC_MSG_CHECKING(--with-local-dir argument)
+  have_local_include=''
+  have_local_lib=''
+  AC_ARG_WITH([local-dir], [  --with-local-dir=PATH   search PATH instead of /usr/local for local libraries.
+  --without-local-dir     do not search /usr/local for local libraries.], [
+    local_dir="$withval"
+    case "$withval" in
+    */*) ;;
+    no)
+      # avoid adding local dir to LDFLAGS and CPPFLAGS
+      have_local_include=yes
+      have_local_lib=yes
+      ;;
+    *) AC_MSG_ERROR(must pass path argument to --with-local-dir) ;;
+    esac
+	AC_MSG_RESULT($local_dir)
+  ], [
+    local_dir=/usr/local
+    AC_MSG_RESULT(Defaulting to $local_dir)
+  ])
+  if test "$GCC" = yes -a "$local_dir" != no; then
+    echo 'void f(){}' > conftest.c
+    dnl Removed -no-cpp-precomp, only needed for OS X 10.2 (Ben Fowler)
+    have_local_include=`${CC-cc} -c -v conftest.c 2>&1 | grep "${local_dir}/include"`
+    have_local_lib=`${CC-cc} -c -v conftest.c 2>&1 | grep "${local_dir}/lib"`
+    rm -f conftest.c conftest.o
+  fi
+  if test -z "$have_local_lib" -a -d "${local_dir}/lib"; then
+    tt=`echo "$LDFLAGS" | sed -e "s+-L${local_dir}/lib ++g" -e "s+-L${local_dir}/lib$++g"`
+    if test "$tt" = "$LDFLAGS"; then
+      LDFLAGS="$LDFLAGS -L${local_dir}/lib"
+    fi
+  fi
+  if test -z "$have_local_include" -a -d "${local_dir}/include"; then
+    tt=`echo "$CPPFLAGS" | sed -e "s+-I${local_dir}/include ++g" -e "s+-I${local_dir}/include$++g"`
+    if test "$tt" = "$CPPFLAGS"; then
+      CPPFLAGS="$CPPFLAGS -I${local_dir}/include"
+    fi
+  fi
+fi
+
+AC_MSG_CHECKING(--with-vim-name argument)
+AC_ARG_WITH(vim-name, [  --with-vim-name=NAME    what to call the Vim executable],
+	VIMNAME="$withval"; AC_MSG_RESULT($VIMNAME),
+	VIMNAME="vim"; AC_MSG_RESULT(Defaulting to $VIMNAME))
+AC_SUBST(VIMNAME)
+AC_MSG_CHECKING(--with-ex-name argument)
+AC_ARG_WITH(ex-name, [  --with-ex-name=NAME     what to call the Ex executable],
+	EXNAME="$withval"; AC_MSG_RESULT($EXNAME),
+	EXNAME="ex"; AC_MSG_RESULT(Defaulting to ex))
+AC_SUBST(EXNAME)
+AC_MSG_CHECKING(--with-view-name argument)
+AC_ARG_WITH(view-name, [  --with-view-name=NAME   what to call the View executable],
+	VIEWNAME="$withval"; AC_MSG_RESULT($VIEWNAME),
+	VIEWNAME="view"; AC_MSG_RESULT(Defaulting to view))
+AC_SUBST(VIEWNAME)
+
+AC_MSG_CHECKING(--with-global-runtime argument)
+AC_ARG_WITH(global-runtime, [  --with-global-runtime=DIR    global runtime directory in 'runtimepath', comma-separated for multiple directories],
+	RUNTIME_GLOBAL="$withval"; AC_MSG_RESULT($withval),
+	AC_MSG_RESULT(no))
+
+if test "X$RUNTIME_GLOBAL" != "X"; then
+  RUNTIME_GLOBAL_AFTER=$(printf -- "$RUNTIME_GLOBAL\\n" | $AWK -F, 'BEGIN { comma=0 } { for (i = NF; i > 0; i--) { if (comma) { printf ",%s/after", $i } else { printf "%s/after", $i; comma=1 } } } END { printf "\n" }')
+  AC_DEFINE_UNQUOTED(RUNTIME_GLOBAL, "$RUNTIME_GLOBAL")
+  AC_DEFINE_UNQUOTED(RUNTIME_GLOBAL_AFTER, "$RUNTIME_GLOBAL_AFTER")
+fi
+
+AC_MSG_CHECKING(--with-modified-by argument)
+AC_ARG_WITH(modified-by, [  --with-modified-by=NAME       name of who modified a release version],
+	AC_MSG_RESULT($withval); AC_DEFINE_UNQUOTED(MODIFIED_BY, "$withval"),
+	AC_MSG_RESULT(no))
+
+dnl Check for EBCDIC stolen from the LYNX port to z/OS Unix
+AC_MSG_CHECKING(if character set is EBCDIC)
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([ ],
+[ /* TryCompile function for CharSet.
+   Treat any failure as ASCII for compatibility with existing art.
+   Use compile-time rather than run-time tests for cross-compiler
+   tolerance.  */
+#if '0'!=240
+make an error "Character set is not EBCDIC"
+#endif ])],
+[ # TryCompile action if true
+cf_cv_ebcdic=yes ],
+[ # TryCompile action if false
+cf_cv_ebcdic=no])
+# end of TryCompile ])
+# end of CacheVal CvEbcdic
+AC_MSG_RESULT($cf_cv_ebcdic)
+case "$cf_cv_ebcdic" in  #(vi
+    yes)	AC_DEFINE(EBCDIC)
+		line_break='"\\n"'
+		;;
+    *)		line_break='"\\012"';;
+esac
+AC_SUBST(line_break)
+
+if test "$cf_cv_ebcdic" = "yes"; then
+dnl If we have EBCDIC we most likely have z/OS Unix, let's test it!
+AC_MSG_CHECKING(for z/OS Unix)
+case $vim_cv_uname_output in
+    OS/390)	zOSUnix="yes";
+		dnl If using cc the environment variable _CC_CCMODE must be
+		dnl set to "1", so that some compiler extensions are enabled.
+		dnl If using c89 the environment variable is named _CC_C89MODE.
+		dnl Note: compile with c89 never tested.
+		if test "$CC" = "cc"; then
+		  ccm="$_CC_CCMODE"
+		  ccn="CC"
+		else
+		  if test "$CC" = "c89"; then
+		    ccm="$_CC_C89MODE"
+		    ccn="C89"
+		  else
+		    ccm=1
+		  fi
+		fi
+		if test "$ccm" != "1"; then
+		  echo ""
+		  echo "------------------------------------------"
+		  echo " On z/OS Unix, the environment variable"
+		  echo " _CC_${ccn}MODE must be set to \"1\"!"
+		  echo " Do:"
+		  echo "    export _CC_${ccn}MODE=1"
+		  echo " and then call configure again."
+		  echo "------------------------------------------"
+		  exit 1
+		fi
+		# Set CFLAGS for configure process.
+		# This will be reset later for config.mk.
+		# Use haltonmsg to force error for missing H files.
+		CFLAGS="$CFLAGS -D_ALL_SOURCE -Wc,float(ieee),haltonmsg(3296)";
+		LDFLAGS="$LDFLAGS -Wl,EDIT=NO"
+		AC_MSG_RESULT(yes)
+		;;
+    *)		zOSUnix="no";
+		AC_MSG_RESULT(no)
+		;;
+esac
+fi
+
+dnl Set QUOTESED. Needs additional backslashes on zOS
+if test "$zOSUnix" = "yes"; then
+    QUOTESED="sed -e 's/[[\\\\\"]]/\\\\\\\\&/g' -e 's/\\\\\\\\\"/\"/' -e 's/\\\\\\\\\";\$\$/\";/' -e 's/  */ /g'"
+else
+    QUOTESED="sed -e 's/[[\\\\\"]]/\\\\&/g' -e 's/\\\\\"/\"/' -e 's/\\\\\";\$\$/\";/' -e 's/  */ /g'"
+fi
+AC_SUBST(QUOTESED)
+
+
+dnl Link with -lsmack for Smack stuff; if not found
+AC_MSG_CHECKING(--disable-smack argument)
+AC_ARG_ENABLE(smack,
+	[  --disable-smack	  Do not check for Smack support.],
+	, enable_smack="yes")
+if test "$enable_smack" = "yes"; then
+  AC_MSG_RESULT(no)
+  AC_CHECK_HEADER([linux/xattr.h], true, enable_smack="no")
+else
+  AC_MSG_RESULT(yes)
+fi
+if test "$enable_smack" = "yes"; then
+  AC_CHECK_HEADER([sys/xattr.h], true, enable_smack="no")
+fi
+if test "$enable_smack" = "yes"; then
+  AC_MSG_CHECKING(for XATTR_NAME_SMACKEXEC in linux/xattr.h)
+  AC_EGREP_CPP(XATTR_NAME_SMACKEXEC, [#include <linux/xattr.h>],
+	       AC_MSG_RESULT(yes),
+	       AC_MSG_RESULT(no); enable_smack="no")
+fi
+if test "$enable_smack" = "yes"; then
+  AC_CHECK_LIB(attr, setxattr,
+	  [LIBS="$LIBS -lattr"
+	   found_smack="yes"
+	   AC_DEFINE(HAVE_SMACK)])
+fi
+
+dnl When smack was found don't search for SELinux
+if test "x$found_smack" = "x"; then
+  dnl Link with -lselinux for SELinux stuff; if not found
+  AC_MSG_CHECKING(--disable-selinux argument)
+  AC_ARG_ENABLE(selinux,
+	  [  --disable-selinux	  Do not check for SELinux support.],
+	  , enable_selinux="yes")
+  if test "$enable_selinux" = "yes"; then
+    AC_MSG_RESULT(no)
+    AC_CHECK_LIB(selinux, is_selinux_enabled,
+	[AC_CHECK_HEADER(selinux/selinux.h,
+	    [LIBS="$LIBS -lselinux"
+	    AC_DEFINE(HAVE_SELINUX)])])
+  else
+     AC_MSG_RESULT(yes)
+  fi
+fi
+
+dnl enable xattr support
+AC_MSG_CHECKING(--enable-xattr argument)
+AC_ARG_ENABLE(xattr,
+	[  --disable-xattr	  Do not check for XATTR support.],
+	, enable_xattr="yes")
+if test "$enable_xattr" = "yes"; then
+  AC_MSG_RESULT(yes)
+  AC_CHECK_HEADER([sys/xattr.h], [AC_DEFINE(HAVE_XATTR)])
+else
+  AC_MSG_RESULT(no)
+fi
+
+dnl Check user requested features.
+
+AC_MSG_CHECKING(--with-features argument)
+AC_ARG_WITH(features, [  --with-features=TYPE    tiny, normal or huge (default: huge)],
+	features="$withval"; AC_MSG_RESULT($features),
+	features="huge"; AC_MSG_RESULT(Defaulting to huge))
+
+dnl "small" is supported for backwards compatibility, now an alias for "tiny"
+dnl "big" is supported for backwards compatibility, now an alias for "normal"
+case "$features" in
+  small) features="tiny"   ;;
+  big)   features="normal" ;;
+esac
+
+dovimdiff=""
+dogvimdiff=""
+case "$features" in
+  tiny)		AC_DEFINE(FEAT_TINY) ;;
+  normal)	AC_DEFINE(FEAT_NORMAL) dovimdiff="installvimdiff";
+			dogvimdiff="installgvimdiff" ;;
+  huge)		AC_DEFINE(FEAT_HUGE) dovimdiff="installvimdiff";
+			dogvimdiff="installgvimdiff" ;;
+  *)		AC_MSG_RESULT([Sorry, $features is not supported]) ;;
+esac
+
+AC_SUBST(dovimdiff)
+AC_SUBST(dogvimdiff)
+
+if test "x$features" = "xtiny"; then
+  has_eval=no
+else
+  has_eval=yes
+fi
+
+AC_MSG_CHECKING(--with-compiledby argument)
+AC_ARG_WITH(compiledby, [  --with-compiledby=NAME  name to show in :version message],
+	compiledby="$withval"; AC_MSG_RESULT($withval),
+	compiledby=""; AC_MSG_RESULT(no))
+AC_SUBST(compiledby)
+
+AC_MSG_CHECKING(--disable-xsmp argument)
+AC_ARG_ENABLE(xsmp,
+	[  --disable-xsmp          Disable XSMP session management],
+	, enable_xsmp="yes")
+
+if test "$enable_xsmp" = "yes"; then
+  AC_MSG_RESULT(no)
+  AC_MSG_CHECKING(--disable-xsmp-interact argument)
+  AC_ARG_ENABLE(xsmp-interact,
+	  [  --disable-xsmp-interact Disable XSMP interaction],
+	  , enable_xsmp_interact="yes")
+  if test "$enable_xsmp_interact" = "yes"; then
+    AC_MSG_RESULT(no)
+    AC_DEFINE(USE_XSMP_INTERACT)
+  else
+    AC_MSG_RESULT(yes)
+  fi
+else
+  AC_MSG_RESULT(yes)
+fi
+
+AC_MSG_CHECKING([diff feature])
+if test "x$features" = "xtiny"; then
+  AC_MSG_RESULT([disabled in $features version])
+else
+  AC_MSG_RESULT(enabled)
+  AC_DEFINE(FEAT_DIFF)
+  XDIFF_OBJS_USED="\$(XDIFF_OBJS)"
+  AC_SUBST(XDIFF_OBJS_USED)
+fi
+
+dnl Check for Lua feature.
+AC_MSG_CHECKING(--enable-luainterp argument)
+AC_ARG_ENABLE(luainterp,
+	[  --enable-luainterp[=OPTS]      Include Lua interpreter.  [default=no] [OPTS=no/yes/dynamic]], ,
+	[enable_luainterp="no"])
+AC_MSG_RESULT($enable_luainterp)
+
+if test "$enable_luainterp" = "yes" -o "$enable_luainterp" = "dynamic"; then
+  if test "$has_eval" = "no"; then
+    AC_MSG_ERROR([cannot use Lua with tiny features])
+  fi
+
+  dnl -- find the lua executable
+  AC_SUBST(vi_cv_path_lua)
+
+  AC_MSG_CHECKING(--with-lua-prefix argument)
+  AC_ARG_WITH(lua_prefix,
+	[  --with-lua-prefix=PFX   Prefix where Lua is installed.],
+	with_lua_prefix="$withval"; AC_MSG_RESULT($with_lua_prefix),
+	with_lua_prefix="";AC_MSG_RESULT(no))
+
+  if test "X$with_lua_prefix" != "X"; then
+       vi_cv_path_lua_pfx="$with_lua_prefix"
+  else
+    AC_MSG_CHECKING(LUA_PREFIX environment var)
+    if test "X$LUA_PREFIX" != "X"; then
+	AC_MSG_RESULT("$LUA_PREFIX")
+	vi_cv_path_lua_pfx="$LUA_PREFIX"
+    else
+	AC_MSG_RESULT([not set, default to /usr])
+	vi_cv_path_lua_pfx="/usr"
+    fi
+  fi
+
+  AC_MSG_CHECKING(--with-luajit)
+  AC_ARG_WITH(luajit,
+	[  --with-luajit           Link with LuaJIT instead of Lua.],
+	[vi_cv_with_luajit="$withval"],
+	[vi_cv_with_luajit="no"])
+  AC_MSG_RESULT($vi_cv_with_luajit)
+
+  LUA_INC=
+  if test "X$vi_cv_path_lua_pfx" != "X"; then
+    if test "x$vi_cv_with_luajit" != "xno"; then
+      dnl -- try to find LuaJIT executable
+      AC_PATH_PROG(vi_cv_path_luajit, luajit)
+      if test "X$vi_cv_path_luajit" != "X"; then
+	dnl -- find LuaJIT version
+	AC_CACHE_CHECK(LuaJIT version, vi_cv_version_luajit,
+       [ vi_cv_version_luajit=`${vi_cv_path_luajit} -v 2>&1 | sed 's/LuaJIT \([[0-9.]]*\)\.[[0-9]]\(-*[[a-z0-9]]*\)* .*/\1/'` ])
+	AC_CACHE_CHECK(Lua version of LuaJIT, vi_cv_version_lua_luajit,
+	[ vi_cv_version_lua_luajit=`${vi_cv_path_luajit} -e "print(_VERSION)" | sed 's/.* //'` ])
+	vi_cv_path_lua="$vi_cv_path_luajit"
+	vi_cv_version_lua="$vi_cv_version_lua_luajit"
+      fi
+    else
+      dnl -- try to find Lua executable
+      AC_PATH_PROG(vi_cv_path_plain_lua, lua)
+      if test "X$vi_cv_path_plain_lua" != "X"; then
+	dnl -- find Lua version
+	AC_CACHE_CHECK(Lua version, vi_cv_version_plain_lua,
+	[ vi_cv_version_plain_lua=`${vi_cv_path_plain_lua} -e "print(_VERSION)" | sed 's/.* //'` ])
+      fi
+      vi_cv_path_lua="$vi_cv_path_plain_lua"
+      vi_cv_version_lua="$vi_cv_version_plain_lua"
+    fi
+    if test "x$vi_cv_with_luajit" != "xno" && test "X$vi_cv_version_luajit" != "X"; then
+      AC_MSG_CHECKING(if lua.h can be found in $vi_cv_path_lua_pfx/include/luajit-$vi_cv_version_luajit)
+      if test -f "$vi_cv_path_lua_pfx/include/luajit-$vi_cv_version_luajit/lua.h"; then
+	AC_MSG_RESULT(yes)
+	LUA_INC=/luajit-$vi_cv_version_luajit
+      fi
+    fi
+    if test "X$LUA_INC" = "X"; then
+      AC_MSG_CHECKING(if lua.h can be found in $vi_cv_path_lua_pfx/include)
+      if test -f "$vi_cv_path_lua_pfx/include/lua.h"; then
+	AC_MSG_RESULT(yes)
+      else
+	AC_MSG_RESULT(no)
+	AC_MSG_CHECKING(if lua.h can be found in $vi_cv_path_lua_pfx/include/lua$vi_cv_version_lua)
+	if test -f "$vi_cv_path_lua_pfx/include/lua$vi_cv_version_lua/lua.h"; then
+	  AC_MSG_RESULT(yes)
+	  LUA_INC=/lua$vi_cv_version_lua
+	else
+	  AC_MSG_RESULT(no)
+
+	  # Detect moonjit:
+	  # https://groups.google.com/forum/#!topic/vim_use/O0vek60WuTk
+	  lua_suf=/moonjit-2.3
+	  inc_path="$vi_cv_path_lua_pfx/include"
+	  for dir in "$inc_path"/moonjit-[[0-9]]* ; do
+	    if test -d "$dir" ; then
+	      lua_suf=`basename "$dir"`
+	      lua_suf="/$lua_suf"
+	      break
+	    fi
+	  done
+	  AC_MSG_CHECKING(if lua.h can be found in $inc_path$lua_suf)
+	  if test -f "$inc_path$lua_suf/lua.h"; then
+	    AC_MSG_RESULT(yes)
+	    LUA_INC=$lua_suf
+	  else
+	    AC_MSG_RESULT(no)
+	    vi_cv_path_lua_pfx=
+	  fi
+	fi
+      fi
+    fi
+  fi
+
+  if test "X$vi_cv_path_lua_pfx" != "X"; then
+    if test "x$vi_cv_with_luajit" != "xno"; then
+      multiarch=`dpkg-architecture -qDEB_HOST_MULTIARCH 2> /dev/null`
+      if test "X$multiarch" != "X"; then
+	lib_multiarch="lib/${multiarch}"
+      else
+	lib_multiarch="lib"
+      fi
+      if test "X$vi_cv_version_lua" = "X"; then
+	LUA_LIBS="-L${vi_cv_path_lua_pfx}/${lib_multiarch} -lluajit"
+      else
+	LUA_LIBS="-L${vi_cv_path_lua_pfx}/${lib_multiarch} -lluajit-$vi_cv_version_lua"
+      fi
+    else
+      dnl Test alternate lib location including version
+      if test -d "${vi_cv_path_lua_pfx}/lib/lua$vi_cv_version_lua"; then
+	LUALIBDIR="lib/lua$vi_cv_version_lua"
+      else
+	LUALIBDIR=lib
+      fi
+      if test "X$LUA_INC" != "X"; then
+	dnl Test alternate name including version
+	LUA_LIBS="-L${vi_cv_path_lua_pfx}/${LUALIBDIR} -llua$vi_cv_version_lua"
+      else
+	LUA_LIBS="-L${vi_cv_path_lua_pfx}/${LUALIBDIR} -llua"
+      fi
+    fi
+    if test "$enable_luainterp" = "dynamic"; then
+      lua_ok="yes"
+    else
+      AC_MSG_CHECKING([if link with ${LUA_LIBS} is sane])
+      libs_save=$LIBS
+      LIBS="$LIBS $LUA_LIBS"
+      AC_LINK_IFELSE([AC_LANG_PROGRAM(,[ ])],
+	AC_MSG_RESULT(yes); lua_ok="yes",
+	AC_MSG_RESULT(no); lua_ok="no"; LUA_LIBS="")
+      LIBS=$libs_save
+    fi
+    if test "x$lua_ok" = "xyes"; then
+      LUA_CFLAGS="-I${vi_cv_path_lua_pfx}/include${LUA_INC}"
+      LUA_SRC="if_lua.c"
+      LUA_OBJ="objects/if_lua.o"
+      LUA_PRO="if_lua.pro"
+      AC_DEFINE(FEAT_LUA)
+    fi
+    if test "$enable_luainterp" = "dynamic"; then
+      if test "x$vi_cv_with_luajit" != "xno"; then
+	luajit="jit"
+      fi
+      if test -f "${vi_cv_path_lua_pfx}/bin/cyglua-${vi_cv_version_lua}.dll"; then
+	vi_cv_dll_name_lua="cyglua-${vi_cv_version_lua}.dll"
+      else
+	if test "x$MACOS_X" = "xyes"; then
+	  ext="dylib"
+	  indexes=""
+	else
+	  ext="so"
+	  indexes=".0 .1 .2 .3 .4 .5 .6 .7 .8 .9"
+	  multiarch=`dpkg-architecture -qDEB_HOST_MULTIARCH 2> /dev/null`
+	  if test "X$multiarch" != "X"; then
+	    lib_multiarch="lib/${multiarch}"
+	  fi
+	fi
+	dnl Determine the sover for the current version, but fallback to
+	dnl liblua${vi_cv_version_lua}.so if no sover-versioned file is found.
+	AC_MSG_CHECKING(if liblua${luajit}*.${ext}* can be found in $vi_cv_path_lua_pfx)
+	for subdir in "${lib_multiarch}" lib64 lib; do
+	  if test -z "$subdir"; then
+	    continue
+	  fi
+	  for sover in "${vi_cv_version_lua}.${ext}" "-${vi_cv_version_lua}.${ext}" \
+	    ".${vi_cv_version_lua}.${ext}" ".${ext}.${vi_cv_version_lua}"; do
+	    for i in $indexes ""; do
+	      if test -f "${vi_cv_path_lua_pfx}/${subdir}/liblua${luajit}${sover}$i"; then
+		sover2="$i"
+		break 3
+	      fi
+	    done
+	  done
+	  sover=""
+	done
+	if test "X$sover" = "X"; then
+	  AC_MSG_RESULT(no)
+	  lua_ok="no"
+	  vi_cv_dll_name_lua="liblua${luajit}.${ext}"
+	else
+	  AC_MSG_RESULT(yes)
+	  lua_ok="yes"
+	  vi_cv_dll_name_lua="liblua${luajit}${sover}$sover2"
+	fi
+      fi
+      AC_DEFINE(DYNAMIC_LUA)
+      LUA_LIBS=""
+      LUA_CFLAGS="-DDYNAMIC_LUA_DLL=\\\"${vi_cv_dll_name_lua}\\\" $LUA_CFLAGS"
+    fi
+    if test "X$LUA_CFLAGS$LUA_LIBS" != "X" && \
+       test "x$MACOS_X" = "xyes" && test "x$vi_cv_with_luajit" != "xno" && \
+       test "$vim_cv_uname_m_output" = "x86_64"; then
+      dnl OSX/x64 requires these flags. See http://luajit.org/install.html
+      LUA_LIBS="-pagezero_size 10000 -image_base 100000000 $LUA_LIBS"
+    fi
+  fi
+  if test "$fail_if_missing" = "yes" -a "$lua_ok" != "yes"; then
+    AC_MSG_ERROR([could not configure lua])
+  fi
+  AC_SUBST(LUA_SRC)
+  AC_SUBST(LUA_OBJ)
+  AC_SUBST(LUA_PRO)
+  AC_SUBST(LUA_LIBS)
+  AC_SUBST(LUA_CFLAGS)
+  AC_SUBST(LUA_CFLAGS_EXTRA)
+fi
+
+
+dnl Check for MzScheme feature.
+AC_MSG_CHECKING(--enable-mzschemeinterp argument)
+AC_ARG_ENABLE(mzschemeinterp,
+	[  --enable-mzschemeinterp      Include MzScheme interpreter.], ,
+	[enable_mzschemeinterp="no"])
+AC_MSG_RESULT($enable_mzschemeinterp)
+
+if test "$enable_mzschemeinterp" = "yes"; then
+  dnl -- find the mzscheme executable
+  AC_SUBST(vi_cv_path_mzscheme)
+
+  AC_MSG_CHECKING(--with-plthome argument)
+  AC_ARG_WITH(plthome,
+	[  --with-plthome=PLTHOME   Use PLTHOME.],
+	with_plthome="$withval"; AC_MSG_RESULT($with_plthome),
+	with_plthome="";AC_MSG_RESULT("no"))
+
+  if test "X$with_plthome" != "X"; then
+       vi_cv_path_mzscheme_pfx="$with_plthome"
+       vi_cv_path_mzscheme="${vi_cv_path_mzscheme_pfx}/bin/mzscheme"
+  else
+    AC_MSG_CHECKING(PLTHOME environment var)
+    if test "X$PLTHOME" != "X"; then
+	AC_MSG_RESULT("$PLTHOME")
+	vi_cv_path_mzscheme_pfx="$PLTHOME"
+	vi_cv_path_mzscheme="${vi_cv_path_mzscheme_pfx}/bin/mzscheme"
+    else
+	AC_MSG_RESULT(not set)
+	dnl -- try to find MzScheme executable
+	AC_PATH_PROG(vi_cv_path_mzscheme, mzscheme)
+
+	dnl resolve symbolic link, the executable is often elsewhere and there
+	dnl are no links for the include files.
+	if test "X$vi_cv_path_mzscheme" != "X"; then
+	  lsout=`ls -l $vi_cv_path_mzscheme`
+	  if echo "$lsout" | grep -e '->' >/dev/null 2>/dev/null; then
+	    vi_cv_path_mzscheme=`echo "$lsout" | sed 's/.*-> \(.*\)/\1/'`
+	  fi
+	fi
+
+	if test "X$vi_cv_path_mzscheme" != "X"; then
+	    dnl -- find where MzScheme thinks it was installed
+	    AC_CACHE_CHECK(MzScheme install prefix,vi_cv_path_mzscheme_pfx,
+	    dnl different versions of MzScheme differ in command line processing
+	    dnl use universal approach
+	    echo "(display (simplify-path		\
+	       (build-path (call-with-values	\
+		(lambda () (split-path (find-system-path (quote exec-file)))) \
+		(lambda (base name must-be-dir?) base)) (quote up))))" > mzdirs.scm
+	    dnl Remove a trailing slash
+	    [ vi_cv_path_mzscheme_pfx=`${vi_cv_path_mzscheme} -r mzdirs.scm | \
+		sed -e 's+/$++'` ])
+	    rm -f mzdirs.scm
+	fi
+    fi
+  fi
+
+  if test "X$vi_cv_path_mzscheme_pfx" != "X"; then
+    AC_MSG_CHECKING(for racket include directory)
+    SCHEME_INC=`${vi_cv_path_mzscheme} -e '(require setup/dirs)(let ((p (find-include-dir))) (when (path? p) (display p)))'`
+    if test "X$SCHEME_INC" != "X"; then
+      AC_MSG_RESULT(${SCHEME_INC})
+    else
+      AC_MSG_RESULT(not found)
+      AC_MSG_CHECKING(if scheme.h can be found in $vi_cv_path_mzscheme_pfx/include)
+      if test -f "$vi_cv_path_mzscheme_pfx/include/scheme.h"; then
+	SCHEME_INC=${vi_cv_path_mzscheme_pfx}/include
+	AC_MSG_RESULT(yes)
+      else
+	AC_MSG_RESULT(no)
+	AC_MSG_CHECKING(if scheme.h can be found in $vi_cv_path_mzscheme_pfx/include/plt)
+	if test -f "$vi_cv_path_mzscheme_pfx/include/plt/scheme.h"; then
+	  AC_MSG_RESULT(yes)
+	  SCHEME_INC=${vi_cv_path_mzscheme_pfx}/include/plt
+	else
+	  AC_MSG_RESULT(no)
+	  AC_MSG_CHECKING(if scheme.h can be found in $vi_cv_path_mzscheme_pfx/include/racket)
+	  if test -f "$vi_cv_path_mzscheme_pfx/include/racket/scheme.h"; then
+	    AC_MSG_RESULT(yes)
+	    SCHEME_INC=${vi_cv_path_mzscheme_pfx}/include/racket
+	  else
+	    AC_MSG_RESULT(no)
+	    AC_MSG_CHECKING(if scheme.h can be found in /usr/include/plt/)
+	    if test -f /usr/include/plt/scheme.h; then
+	      AC_MSG_RESULT(yes)
+	      SCHEME_INC=/usr/include/plt
+	    else
+	      AC_MSG_RESULT(no)
+	      AC_MSG_CHECKING(if scheme.h can be found in /usr/include/racket/)
+	      if test -f /usr/include/racket/scheme.h; then
+		AC_MSG_RESULT(yes)
+		SCHEME_INC=/usr/include/racket
+	      else
+		AC_MSG_RESULT(no)
+		vi_cv_path_mzscheme_pfx=
+	      fi
+	    fi
+	  fi
+	fi
+      fi
+    fi
+  fi
+
+  if test "X$vi_cv_path_mzscheme_pfx" != "X"; then
+
+    AC_MSG_CHECKING(for racket lib directory)
+    SCHEME_LIB=`${vi_cv_path_mzscheme} -e '(require setup/dirs)(let ((p (find-lib-dir))) (when (path? p) (display p)))'`
+    if test "X$SCHEME_LIB" != "X"; then
+      AC_MSG_RESULT(${SCHEME_LIB})
+    else
+      AC_MSG_RESULT(not found)
+    fi
+
+    for path in "${vi_cv_path_mzscheme_pfx}/lib" "${SCHEME_LIB}"; do
+      if test "X$path" != "X"; then
+	if test "x$MACOS_X" = "xyes"; then
+	  MZSCHEME_LIBS="-framework Racket"
+	  MZSCHEME_CFLAGS="-DMZ_PRECISE_GC"
+	elif test -f "${path}/libmzscheme3m.a"; then
+	  MZSCHEME_LIBS="${path}/libmzscheme3m.a"
+	  MZSCHEME_CFLAGS="-DMZ_PRECISE_GC"
+	elif test -f "${path}/libracket3m.a"; then
+	  MZSCHEME_LIBS="${path}/libracket3m.a"
+	  if test -f "${path}/librktio.a"; then
+	    MZSCHEME_LIBS="${MZSCHEME_LIBS} ${path}/librktio.a"
+	  fi
+	  MZSCHEME_CFLAGS="-DMZ_PRECISE_GC"
+	elif test -f "${path}/libracket.a"; then
+	  MZSCHEME_LIBS="${path}/libracket.a ${path}/libmzgc.a"
+	elif test -f "${path}/libmzscheme.a"; then
+	  MZSCHEME_LIBS="${path}/libmzscheme.a ${path}/libmzgc.a"
+	else
+	  dnl Using shared objects
+	  if test -f "${path}/libmzscheme3m.so"; then
+	    MZSCHEME_LIBS="-L${path} -lmzscheme3m"
+	    MZSCHEME_CFLAGS="-DMZ_PRECISE_GC"
+	  elif test -f "${path}/libracket3m.so"; then
+	    MZSCHEME_LIBS="-L${path} -lracket3m"
+	    MZSCHEME_CFLAGS="-DMZ_PRECISE_GC"
+	  elif test -f "${path}/libracket.so"; then
+	    MZSCHEME_LIBS="-L${path} -lracket -lmzgc"
+	  else
+	    dnl try next until last
+	    if test "$path" != "$SCHEME_LIB"; then
+	      continue
+	    fi
+	    MZSCHEME_LIBS="-L${path} -lmzscheme -lmzgc"
+	  fi
+	  if test "$GCC" = yes; then
+	    dnl Make Vim remember the path to the library.  For when it's not in
+	    dnl $LD_LIBRARY_PATH.
+	    MZSCHEME_LIBS="${MZSCHEME_LIBS} -Wl,-rpath -Wl,${path}"
+	  elif test "$vim_cv_uname_output" = SunOS &&
+			   echo $vim_cv_uname_r_output | grep '^5' >/dev/null; then
+	    MZSCHEME_LIBS="${MZSCHEME_LIBS} -R ${path}"
+	  fi
+	fi
+      fi
+      if test "X$MZSCHEME_LIBS" != "X"; then
+	break
+      fi
+    done
+
+    AC_MSG_CHECKING([if racket requires -pthread])
+    if test "X$SCHEME_LIB" != "X" && $FGREP -e -pthread "$SCHEME_LIB/buildinfo" >/dev/null ; then
+      AC_MSG_RESULT(yes)
+      MZSCHEME_LIBS="${MZSCHEME_LIBS} -pthread"
+      MZSCHEME_CFLAGS="${MZSCHEME_CFLAGS} -pthread"
+    else
+      AC_MSG_RESULT(no)
+    fi
+
+    AC_MSG_CHECKING(for racket config directory)
+    SCHEME_CONFIGDIR=`${vi_cv_path_mzscheme} -e '(require setup/dirs)(let ((p (find-config-dir))) (when (path? p) (display p)))'`
+    if test "X$SCHEME_CONFIGDIR" != "X"; then
+      MZSCHEME_CFLAGS="${MZSCHEME_CFLAGS} -DMZSCHEME_CONFIGDIR='\"${SCHEME_CONFIGDIR}\"'"
+      AC_MSG_RESULT(${SCHEME_CONFIGDIR})
+    else
+      AC_MSG_RESULT(not found)
+    fi
+
+    AC_MSG_CHECKING(for racket collects directory)
+    SCHEME_COLLECTS=`${vi_cv_path_mzscheme} -e '(require setup/dirs)(let ((p (find-collects-dir))) (when (path? p) (let-values (((base _1 _2) (split-path p))) (display base))))'`
+    if test "X$SCHEME_COLLECTS" = "X"; then
+      if test -d "$vi_cv_path_mzscheme_pfx/lib/plt/collects"; then
+	SCHEME_COLLECTS=$vi_cv_path_mzscheme_pfx/lib/plt/
+      else
+	if test -d "$vi_cv_path_mzscheme_pfx/lib/racket/collects"; then
+	  SCHEME_COLLECTS=$vi_cv_path_mzscheme_pfx/lib/racket/
+	else
+	  if test -d "$vi_cv_path_mzscheme_pfx/share/racket/collects"; then
+	    SCHEME_COLLECTS=$vi_cv_path_mzscheme_pfx/share/racket/
+	  else
+	    if test -d "$vi_cv_path_mzscheme_pfx/collects"; then
+	      SCHEME_COLLECTS=$vi_cv_path_mzscheme_pfx/
+	    fi
+	  fi
+	fi
+      fi
+    fi
+    if test "X$SCHEME_COLLECTS" != "X" ; then
+      AC_MSG_RESULT(${SCHEME_COLLECTS})
+    else
+      AC_MSG_RESULT(not found)
+    fi
+
+    AC_MSG_CHECKING(for mzscheme_base.c)
+    if test -f "${SCHEME_COLLECTS}collects/scheme/base.ss" ; then
+      MZSCHEME_EXTRA="mzscheme_base.c"
+      MZSCHEME_MZC="${vi_cv_path_mzscheme_pfx}/bin/mzc"
+      MZSCHEME_MOD="++lib scheme/base"
+    else
+      if test -f "${SCHEME_COLLECTS}collects/scheme/base.rkt" ; then
+	MZSCHEME_EXTRA="mzscheme_base.c"
+	MZSCHEME_MZC="${vi_cv_path_mzscheme_pfx}/bin/mzc"
+	MZSCHEME_MOD="++lib scheme/base"
+      else
+	if test -f "${SCHEME_COLLECTS}collects/racket/base.rkt" ; then
+	  MZSCHEME_EXTRA="mzscheme_base.c"
+	  MZSCHEME_MZC="${vi_cv_path_mzscheme_pfx}/bin/raco ctool"
+	  MZSCHEME_MOD=""
+	fi
+      fi
+    fi
+    if test "X$MZSCHEME_EXTRA" != "X" ; then
+      dnl need to generate bytecode for MzScheme base
+      MZSCHEME_CFLAGS="${MZSCHEME_CFLAGS} -DINCLUDE_MZSCHEME_BASE"
+      AC_MSG_RESULT(needed)
+    else
+      AC_MSG_RESULT(not needed)
+    fi
+
+    dnl On Ubuntu this fixes "undefined reference to symbol 'ffi_type_void'".
+    AC_CHECK_LIB(ffi, ffi_type_void, [MZSCHEME_LIBS="$MZSCHEME_LIBS -lffi"])
+
+    MZSCHEME_CFLAGS="${MZSCHEME_CFLAGS} -I${SCHEME_INC} \
+      -DMZSCHEME_COLLECTS='\"${SCHEME_COLLECTS}collects\"'"
+
+    dnl Test that we can compile a simple program with these CFLAGS and LIBS.
+    AC_MSG_CHECKING([if compile and link flags for MzScheme are sane])
+    cflags_save=$CFLAGS
+    libs_save=$LIBS
+    CFLAGS="$CFLAGS $MZSCHEME_CFLAGS"
+    LIBS="$LIBS $MZSCHEME_LIBS"
+    AC_LINK_IFELSE([AC_LANG_PROGRAM(,[ ])],
+	   AC_MSG_RESULT(yes); mzs_ok=yes,
+	   AC_MSG_RESULT(no: MZSCHEME DISABLED); mzs_ok=no)
+    CFLAGS=$cflags_save
+    LIBS=$libs_save
+    if test $mzs_ok = yes; then
+      MZSCHEME_SRC="if_mzsch.c"
+      MZSCHEME_OBJ="objects/if_mzsch.o"
+      MZSCHEME_PRO="if_mzsch.pro"
+      AC_DEFINE(FEAT_MZSCHEME)
+    else
+      MZSCHEME_CFLAGS=
+      MZSCHEME_LIBS=
+      MZSCHEME_EXTRA=
+      MZSCHEME_MZC=
+    fi
+  fi
+  AC_SUBST(MZSCHEME_SRC)
+  AC_SUBST(MZSCHEME_OBJ)
+  AC_SUBST(MZSCHEME_PRO)
+  AC_SUBST(MZSCHEME_LIBS)
+  AC_SUBST(MZSCHEME_CFLAGS)
+  AC_SUBST(MZSCHEME_EXTRA)
+  AC_SUBST(MZSCHEME_MZC)
+fi
+
+
+AC_MSG_CHECKING(--enable-perlinterp argument)
+AC_ARG_ENABLE(perlinterp,
+	[  --enable-perlinterp[=OPTS]     Include Perl interpreter.  [default=no] [OPTS=no/yes/dynamic]], ,
+	[enable_perlinterp="no"])
+AC_MSG_RESULT($enable_perlinterp)
+if test "$enable_perlinterp" = "yes" -o "$enable_perlinterp" = "dynamic"; then
+  if test "$has_eval" = "no"; then
+    AC_MSG_ERROR([cannot use Perl with tiny features])
+  fi
+  AC_SUBST(vi_cv_path_perl)
+  AC_PATH_PROG(vi_cv_path_perl, perl)
+  if test "X$vi_cv_path_perl" != "X"; then
+    AC_MSG_CHECKING(Perl version)
+    if $vi_cv_path_perl -e 'require 5.003_01' >/dev/null 2>/dev/null; then
+     eval `$vi_cv_path_perl -V:usethreads`
+     eval `$vi_cv_path_perl -V:libperl`
+     if test "X$usethreads" = "XUNKNOWN" -o "X$usethreads" = "Xundef"; then
+       badthreads=no
+     else
+       if $vi_cv_path_perl -e 'require 5.6.0' >/dev/null 2>/dev/null; then
+	 eval `$vi_cv_path_perl -V:use5005threads`
+	 if test "X$use5005threads" = "XUNKNOWN" -o "X$use5005threads" = "Xundef"; then
+	   badthreads=no
+	 else
+	   badthreads=yes
+	   AC_MSG_RESULT(>>> Perl > 5.6 with 5.5 threads cannot be used <<<)
+	 fi
+       else
+	 badthreads=yes
+	 AC_MSG_RESULT(>>> Perl 5.5 with threads cannot be used <<<)
+       fi
+     fi
+     if test $badthreads = no; then
+      AC_MSG_RESULT(OK)
+      eval `$vi_cv_path_perl -V:shrpenv`
+      if test "X$shrpenv" = "XUNKNOWN"; then # pre 5.003_04
+	shrpenv=""
+      fi
+      vi_cv_perllib=`$vi_cv_path_perl -MConfig -e 'print $Config{privlibexp}'`
+      AC_SUBST(vi_cv_perllib)
+      vi_cv_perl_extutils=unknown_perl_extutils_path
+
+      AC_MSG_CHECKING(--with-xsubpp path)
+      vi_cv_perl_xsubpp=
+      AC_ARG_WITH(xsubpp, [  --with-xsubpp=PATH  path to the xsubpp command], [
+            if test -f "$withval"
+            then
+	      vi_cv_perl_xsubpp="$withval"
+            fi
+      ])
+
+      if test "x$vi_cv_perl_xsubpp" = "x"
+      then
+	for extutils_rel_path in ExtUtils vendor_perl/ExtUtils; do
+	  xsubpp_path="$vi_cv_perllib/$extutils_rel_path/xsubpp"
+	  if test -f "$xsubpp_path"; then
+	    vi_cv_perl_xsubpp="$xsubpp_path"
+	  fi
+	done
+      fi
+
+      if test "x$vi_cv_perl_xsubpp" = "x"
+      then
+        AC_MSG_RESULT(empty)
+      else
+        AC_MSG_RESULT($vi_cv_perl_xsubpp)
+      fi
+      AC_SUBST(vi_cv_perl_xsubpp)
+
+      dnl Remove "-fno-something", it breaks using cproto.
+      dnl Remove "-fdebug-prefix-map", it isn't supported by clang.
+      dnl Remove "FORTIFY_SOURCE", it will be defined twice.
+      dnl remove -pipe and -Wxxx, it confuses cproto
+      perlcppflags=`$vi_cv_path_perl -Mlib=$srcdir -MExtUtils::Embed \
+		-e 'ccflags;perl_inc;print"\n"' | sed -e 's/-fno[[^ ]]*//' \
+		-e 's/-fdebug-prefix-map[[^ ]]*//g' \
+		-e 's/-pipe //' \
+		-e 's/-W[[^ ]]*//g' \
+		-e 's/-D_FORTIFY_SOURCE=.//g'`
+      dnl Remove "-lc", it breaks on FreeBSD when using "-pthread".
+      perllibs=`cd $srcdir; $vi_cv_path_perl -MExtUtils::Embed -e 'ldopts' | \
+		sed -e '/Warning/d' -e '/Note (probably harmless)/d' \
+			-e 's/-bE:perl.exp//' -e 's/-lc //'`
+      dnl Don't add perl lib to $LIBS: if it's not in LD_LIBRARY_PATH
+      dnl a test in configure may fail because of that.
+      perlldflags=`cd $srcdir; $vi_cv_path_perl -MExtUtils::Embed \
+		-e 'ccdlflags' | sed -e 's/-bE:perl.exp//'`
+
+      dnl check that compiling a simple program still works with the flags
+      dnl added for Perl.
+      AC_MSG_CHECKING([if compile and link flags for Perl are sane])
+      cflags_save=$CFLAGS
+      libs_save=$LIBS
+      ldflags_save=$LDFLAGS
+      CFLAGS="$CFLAGS $perlcppflags"
+      LIBS="$LIBS $perllibs"
+      perlldflags=`echo "$perlldflags" | sed -e 's/^ *//g'`
+      LDFLAGS="$perlldflags $LDFLAGS"
+      AC_LINK_IFELSE([AC_LANG_PROGRAM(,[ ])],
+	     AC_MSG_RESULT(yes); perl_ok=yes,
+	     AC_MSG_RESULT(no: PERL DISABLED); perl_ok=no)
+      CFLAGS=$cflags_save
+      LIBS=$libs_save
+      LDFLAGS=$ldflags_save
+      if test $perl_ok = yes; then
+	if test "X$perlcppflags" != "X"; then
+	  PERL_CFLAGS=$perlcppflags
+	fi
+	if test "X$perlldflags" != "X"; then
+	  if test "X`echo \"$LDFLAGS\" | $FGREP -e \"$perlldflags\"`" = "X"; then
+	    LDFLAGS="$perlldflags $LDFLAGS"
+	  fi
+	fi
+	PERL_LIBS=$perllibs
+	PERL_SRC="auto/if_perl.c if_perlsfio.c"
+	PERL_OBJ="objects/if_perl.o objects/if_perlsfio.o"
+	PERL_PRO="if_perl.pro if_perlsfio.pro"
+	AC_DEFINE(FEAT_PERL)
+      fi
+     fi
+    else
+      AC_MSG_RESULT(>>> too old; need Perl version 5.003_01 or later <<<)
+    fi
+  fi
+
+  if test "x$MACOS_X" = "xyes"; then
+    dnl Mac OS X 10.2 or later
+    dir=/System/Library/Perl
+    darwindir=$dir/darwin
+    if test -d $darwindir; then
+      PERL=/usr/bin/perl
+    else
+      dnl Mac OS X 10.3
+      dir=/System/Library/Perl/5.8.1
+      darwindir=$dir/darwin-thread-multi-2level
+      if test -d $darwindir; then
+	PERL=/usr/bin/perl
+      fi
+    fi
+    if test -n "$PERL"; then
+      PERL_DIR="$dir"
+      PERL_CFLAGS="-DFEAT_PERL -I$darwindir/CORE"
+      PERL_OBJ="objects/if_perl.o objects/if_perlsfio.o $darwindir/auto/DynaLoader/DynaLoader.a"
+      PERL_LIBS="-L$darwindir/CORE -lperl"
+    fi
+    dnl Perl on Mac OS X 10.5 adds "-arch" flags but these should only
+    dnl be included if requested by passing --with-mac-arch to
+    dnl configure, so strip these flags first (if present)
+    PERL_LIBS=`echo "$PERL_LIBS" | sed -e 's/-arch\ ppc//' -e 's/-arch\ i386//' -e 's/-arch\ x86_64//'`
+    PERL_CFLAGS=`echo "$PERL_CFLAGS" | sed -e 's/-arch\ ppc//' -e 's/-arch\ i386//' -e 's/-arch\ x86_64//'`
+  fi
+  if test "$enable_perlinterp" = "dynamic"; then
+    if test "$perl_ok" = "yes" -a "X$libperl" != "X"; then
+      AC_DEFINE(DYNAMIC_PERL)
+      PERL_CFLAGS="-DDYNAMIC_PERL_DLL=\\\"$libperl\\\" $PERL_CFLAGS"
+      PERL_LIBS=""
+    fi
+  fi
+
+  if test "$fail_if_missing" = "yes" -a "$perl_ok" != "yes"; then
+    AC_MSG_ERROR([could not configure perl])
+  fi
+fi
+AC_SUBST(shrpenv)
+AC_SUBST(PERL_SRC)
+AC_SUBST(PERL_OBJ)
+AC_SUBST(PERL_PRO)
+AC_SUBST(PERL_CFLAGS)
+AC_SUBST(PERL_CFLAGS_EXTRA)
+AC_SUBST(PERL_LIBS)
+
+AC_MSG_CHECKING(--enable-pythoninterp argument)
+AC_ARG_ENABLE(pythoninterp,
+	[  --enable-pythoninterp[=OPTS]   Include Python interpreter. [default=no] [OPTS=no/yes/dynamic]], ,
+	[enable_pythoninterp="no"])
+AC_MSG_RESULT($enable_pythoninterp)
+if test "$enable_pythoninterp" = "yes" -o "$enable_pythoninterp" = "dynamic"; then
+  if test "$has_eval" = "no"; then
+    AC_MSG_ERROR([cannot use Python with tiny features])
+  fi
+
+  dnl -- find the python executable
+  AC_MSG_CHECKING(--with-python-command argument)
+  AC_SUBST(vi_cv_path_python)
+  AC_ARG_WITH(python-command, [  --with-python-command=NAME  name of the Python 2 command (default: python2 or python)],
+	vi_cv_path_python="$withval"; AC_MSG_RESULT($vi_cv_path_python),
+	AC_MSG_RESULT(no))
+
+  if test "X$vi_cv_path_python" = "X"; then
+    AC_PATH_PROGS(vi_cv_path_python, python2 python)
+  fi
+  if test "X$vi_cv_path_python" != "X"; then
+
+    dnl -- get its version number
+    AC_CACHE_CHECK(Python version,vi_cv_var_python_version,
+    [[vi_cv_var_python_version=`
+	    ${vi_cv_path_python} -c 'import sys; print sys.version[:3]'`
+    ]])
+
+    dnl -- it must be at least version 2.3
+    AC_MSG_CHECKING(Python is 2.3 or better)
+    if ${vi_cv_path_python} -c \
+	"import sys; sys.exit(${vi_cv_var_python_version} < 2.3)"
+    then
+      AC_MSG_RESULT(yep)
+
+      dnl -- find where python thinks it was installed
+      AC_CACHE_CHECK(Python's install prefix,vi_cv_path_python_pfx,
+      [ vi_cv_path_python_pfx=`
+	    ${vi_cv_path_python} -c \
+		"import sys; print sys.prefix"` ])
+
+      dnl -- and where it thinks it runs
+      AC_CACHE_CHECK(Python's execution prefix,vi_cv_path_python_epfx,
+      [ vi_cv_path_python_epfx=`
+	    ${vi_cv_path_python} -c \
+		"import sys; print sys.exec_prefix"` ])
+
+      dnl -- python's internal library path
+
+      AC_CACHE_VAL(vi_cv_path_pythonpath,
+      [ vi_cv_path_pythonpath=`
+	    unset PYTHONPATH;
+	    ${vi_cv_path_python} -c \
+		"import sys, string; print string.join(sys.path,':')"` ])
+
+      dnl -- where the Python implementation library archives are
+
+      AC_ARG_WITH(python-config-dir,
+	[  --with-python-config-dir=PATH  Python's config directory (deprecated)],
+	[ vi_cv_path_python_conf="${withval}"; have_python_config_dir=1 ] )
+
+      AC_CACHE_CHECK(Python's configuration directory,vi_cv_path_python_conf,
+      [
+	vi_cv_path_python_conf=
+	d=`${vi_cv_path_python} -c "import distutils.sysconfig; print distutils.sysconfig.get_config_var('LIBPL')"`
+	if test -d "$d" && test -f "$d/config.c"; then
+	  vi_cv_path_python_conf="$d"
+	else
+	  for path in "${vi_cv_path_python_pfx}" "${vi_cv_path_python_epfx}"; do
+	    for subdir in lib64 lib share; do
+	      d="${path}/${subdir}/python${vi_cv_var_python_version}/config"
+	      if test -d "$d" && test -f "$d/config.c"; then
+		vi_cv_path_python_conf="$d"
+	      fi
+	    done
+	  done
+	fi
+      ])
+
+      PYTHON_CONFDIR="${vi_cv_path_python_conf}"
+
+      if test "X$PYTHON_CONFDIR" = "X"; then
+	AC_MSG_RESULT([can't find it!])
+      else
+
+	dnl -- we need to examine Python's config/Makefile too
+	dnl    see what the interpreter is built from
+	AC_CACHE_VAL(vi_cv_path_python_plibs,
+	[
+	    pwd=`pwd`
+	    tmp_mkf="$pwd/config-PyMake$$"
+	    cat -- "${PYTHON_CONFDIR}/Makefile" - <<'eof' >"${tmp_mkf}"
+__:
+	@echo "python_BASEMODLIBS='$(BASEMODLIBS)'"
+	@echo "python_LIBS='$(LIBS)'"
+	@echo "python_SYSLIBS='$(SYSLIBS)'"
+	@echo "python_LINKFORSHARED='$(LINKFORSHARED)'"
+	@echo "python_DLLLIBRARY='$(DLLLIBRARY)'"
+	@echo "python_INSTSONAME='$(INSTSONAME)'"
+	@echo "python_PYTHONFRAMEWORK='$(PYTHONFRAMEWORK)'"
+	@echo "python_PYTHONFRAMEWORKPREFIX='$(PYTHONFRAMEWORKPREFIX)'"
+	@echo "python_PYTHONFRAMEWORKINSTALLDIR='$(PYTHONFRAMEWORKINSTALLDIR)'"
+eof
+	    dnl -- delete the lines from make about Entering/Leaving directory
+	    eval "`cd ${PYTHON_CONFDIR} && make -f "${tmp_mkf}" __ | sed '/ directory /d'`"
+	    rm -f -- "${tmp_mkf}"
+	    if test "x$MACOS_X" = "xyes" && test -n "${python_PYTHONFRAMEWORK}" && ${vi_cv_path_python} -c \
+		"import sys; sys.exit(${vi_cv_var_python_version} < 2.3)"; then
+	      vi_cv_path_python_plibs="-framework Python"
+	      if test "x${vi_cv_path_python}" != "x/usr/bin/python" && test -n "${python_PYTHONFRAMEWORKPREFIX}"; then
+		  vi_cv_path_python_plibs="-F${python_PYTHONFRAMEWORKPREFIX} -framework Python"
+	      fi
+	    else
+	      vi_cv_path_python_plibs="-L${PYTHON_CONFDIR} -lpython${vi_cv_var_python_version}"
+	      dnl -- Check if the path contained in python_LINKFORSHARED is
+	      dnl    usable for vim build. If not, make and try other
+	      dnl    candidates.
+	      if test -n "${python_LINKFORSHARED}" && test -n "${python_PYTHONFRAMEWORKPREFIX}"; then
+	        python_link_symbol=`echo ${python_LINKFORSHARED} | sed 's/\([[^ \t]][[^ \t]]*[[ \t]][[ \t]]*[[^ \t]][[^ \t]]*\)[[ \t]].*/\1/'`
+		python_link_path=`echo ${python_LINKFORSHARED} |   sed 's/\([[^ \t]][[^ \t]]*[[ \t]][[ \t]]*[[^ \t]][[^ \t]]*\)[[ \t]][[ \t]]*\(.*\)/\2/'`
+	        if test -n "${python_link_path}" && ! test -x "${python_link_path}"; then
+	          dnl -- The path looks relative. Guess the absolute one using
+		  dnl    the prefix and try that.
+	          python_link_path="${python_PYTHONFRAMEWORKPREFIX}/${python_link_path}"
+		  if test -n "${python_link_path}" && ! test -x "${python_link_path}"; then
+		    dnl -- A last resort.
+		    python_link_path="${python_PYTHONFRAMEWORKINSTALLDIR}/Versions/${vi_cv_var_python_version}/${python_PYTHONFRAMEWORK}"
+	            dnl -- No check is done. The last word is left to the
+	            dnl    "sanity" test on link flags that follows shortly.
+		  fi
+	          python_LINKFORSHARED="${python_link_symbol} ${python_link_path}"
+	        fi
+	      fi
+	      vi_cv_path_python_plibs="${vi_cv_path_python_plibs} ${python_BASEMODLIBS} ${python_LIBS} ${python_SYSLIBS} ${python_LINKFORSHARED}"
+	      dnl remove -ltermcap, it can conflict with an earlier -lncurses
+	      vi_cv_path_python_plibs=`echo $vi_cv_path_python_plibs | sed s/-ltermcap//`
+	    fi
+	])
+	AC_CACHE_CHECK(Python's dll name,vi_cv_dll_name_python,
+	[
+	  if test "X$python_DLLLIBRARY" != "X"; then
+	    vi_cv_dll_name_python="$python_DLLLIBRARY"
+	  else
+	    vi_cv_dll_name_python="$python_INSTSONAME"
+	  fi
+	])
+
+	PYTHON_LIBS="${vi_cv_path_python_plibs}"
+	if test "${vi_cv_path_python_pfx}" = "${vi_cv_path_python_epfx}"; then
+	  PYTHON_CFLAGS="-I${vi_cv_path_python_pfx}/include/python${vi_cv_var_python_version}"
+	else
+	  PYTHON_CFLAGS="-I${vi_cv_path_python_pfx}/include/python${vi_cv_var_python_version} -I${vi_cv_path_python_epfx}/include/python${vi_cv_var_python_version}"
+	fi
+	if test "X$have_python_config_dir" = "X1" -a "$enable_pythoninterp" = "dynamic"; then
+	  dnl Define PYTHON_HOME if --with-python-config-dir was used
+	  PYTHON_CFLAGS="${PYTHON_CFLAGS} -DPYTHON_HOME='\"${vi_cv_path_python_pfx}\"'"
+
+	fi
+	PYTHON_SRC="if_python.c"
+	PYTHON_OBJ="objects/if_python.o"
+
+	dnl On FreeBSD linking with "-pthread" is required to use threads.
+	dnl _THREAD_SAFE must be used for compiling then.
+	dnl The "-pthread" is added to $LIBS, so that the following check for
+	dnl sigaltstack() will look in libc_r (it's there in libc!).
+	dnl Otherwise, when using GCC, try adding -pthread to $CFLAGS.  GCC
+	dnl will then define target-specific defines, e.g., -D_REENTRANT.
+	dnl Don't do this for Mac OSX, -pthread will generate a warning.
+	AC_MSG_CHECKING([if -pthread should be used])
+	threadsafe_flag=
+	thread_lib=
+	dnl if test "x$MACOS_X" != "xyes"; then
+        if test "$vim_cv_uname_output" != Darwin; then
+	  test "$GCC" = yes && threadsafe_flag="-pthread"
+	  if test "$vim_cv_uname_output" = FreeBSD; then
+	    threadsafe_flag="-D_THREAD_SAFE"
+	    thread_lib="-pthread"
+	  fi
+	  if test "$vim_cv_uname_output" = SunOS; then
+	    threadsafe_flag="-pthreads"
+	  fi
+	fi
+	libs_save_old=$LIBS
+	if test -n "$threadsafe_flag"; then
+	  cflags_save=$CFLAGS
+	  CFLAGS="$CFLAGS $threadsafe_flag"
+	  LIBS="$LIBS $thread_lib"
+	  AC_LINK_IFELSE([AC_LANG_PROGRAM(,[ ])],
+	     AC_MSG_RESULT(yes); PYTHON_CFLAGS="$PYTHON_CFLAGS $threadsafe_flag",
+	     AC_MSG_RESULT(no); LIBS=$libs_save_old
+	     )
+	  CFLAGS=$cflags_save
+	else
+	  AC_MSG_RESULT(no)
+	fi
+
+	dnl Check that compiling a simple program still works with the flags
+	dnl added for Python.
+	AC_MSG_CHECKING([if compile and link flags for Python are sane])
+	cflags_save=$CFLAGS
+	libs_save=$LIBS
+	CFLAGS="$CFLAGS $PYTHON_CFLAGS"
+	LIBS="$LIBS $PYTHON_LIBS"
+	AC_LINK_IFELSE([AC_LANG_PROGRAM(,[ ])],
+	       AC_MSG_RESULT(yes); python_ok=yes,
+	       AC_MSG_RESULT(no: PYTHON DISABLED); python_ok=no)
+	CFLAGS=$cflags_save
+	LIBS=$libs_save
+	if test $python_ok = yes; then
+	  AC_DEFINE(FEAT_PYTHON)
+	else
+	  LIBS=$libs_save_old
+	  PYTHON_SRC=
+	  PYTHON_OBJ=
+	  PYTHON_LIBS=
+	  PYTHON_CFLAGS=
+	fi
+      fi
+    else
+      AC_MSG_RESULT(too old)
+    fi
+  fi
+
+  if test "$fail_if_missing" = "yes" -a "$python_ok" != "yes"; then
+    AC_MSG_ERROR([could not configure python])
+  fi
+fi
+
+AC_SUBST(PYTHON_LIBS)
+AC_SUBST(PYTHON_CFLAGS)
+AC_SUBST(PYTHON_CFLAGS_EXTRA)
+AC_SUBST(PYTHON_SRC)
+AC_SUBST(PYTHON_OBJ)
+
+
+AC_MSG_CHECKING(--enable-python3interp argument)
+AC_ARG_ENABLE(python3interp,
+	[  --enable-python3interp[=OPTS]  Include Python3 interpreter. [default=no] [OPTS=no/yes/dynamic]], ,
+	[enable_python3interp="no"])
+AC_MSG_RESULT($enable_python3interp)
+if test "$enable_python3interp" = "yes" -o "$enable_python3interp" = "dynamic"; then
+  if test "$has_eval" = "no"; then
+    AC_MSG_ERROR([cannot use Python with tiny features])
+  fi
+
+  dnl -- find the python3 executable
+  AC_MSG_CHECKING(--with-python3-command argument)
+  AC_SUBST(vi_cv_path_python3)
+  AC_ARG_WITH(python3-command, [  --with-python3-command=NAME  name of the Python 3 command (default: python3 or python)],
+	vi_cv_path_python3="$withval"; AC_MSG_RESULT($vi_cv_path_python3),
+	AC_MSG_RESULT(no))
+
+  if test "X$vi_cv_path_python3" = "X"; then
+    AC_PATH_PROGS(vi_cv_path_python3, python3 python)
+  fi
+  if test "X$vi_cv_path_python3" != "X"; then
+
+    dnl -- get its version number
+    AC_CACHE_CHECK(Python version,vi_cv_var_python3_version,
+    [[vi_cv_var_python3_version=`
+          ${vi_cv_path_python3} -c 'import sys; print("{}.{}".format(sys.version_info.major, sys.version_info.minor))'`
+    ]])
+
+    dnl -- it must be at least version 3
+    AC_MSG_CHECKING(Python is 3.0 or better)
+    if ${vi_cv_path_python3} -c \
+      "import sys; sys.exit(${vi_cv_var_python3_version} < 3.0)"
+    then
+      AC_MSG_RESULT(yep)
+
+      dnl -- get the stable ABI version if passed in
+      AC_MSG_CHECKING(--with-python3-stable-abi argument)
+      AC_SUBST(vi_cv_var_python3_stable_abi)
+      AC_ARG_WITH(python3-stable-abi, [  --with-python3-stable-abi=VERSION  stable ABI version to target (e.g. 3.8)],
+        vi_cv_var_python3_stable_abi="$withval"; AC_MSG_RESULT($vi_cv_var_python3_stable_abi),
+        AC_MSG_RESULT(no))
+      if test "X$vi_cv_var_python3_stable_abi" != "X"; then
+        AC_CACHE_VAL(vi_cv_var_python3_stable_abi_hex,
+        [
+         vi_cv_var_python3_stable_abi_hex=`
+         ${vi_cv_path_python3} -c \
+         "major_minor='${vi_cv_var_python3_stable_abi}'.split('.'); print('0x{0:X}'.format( (int(major_minor.__getitem__(0))<<24) + (int(major_minor.__getitem__(1))<<16) ))"` ])
+        if test "X$vi_cv_var_python3_stable_abi_hex" = "X"; then
+          AC_MSG_ERROR([can't parse Python 3 stable ABI version. It should be "<major>.<minor>"])
+        fi
+      fi
+
+      dnl -- get abiflags for python 3.2 or higher (PEP 3149)
+      AC_CACHE_CHECK(Python's abiflags,vi_cv_var_python3_abiflags,
+      [
+       vi_cv_var_python3_abiflags=
+       if ${vi_cv_path_python3} -c \
+           "import sys; sys.exit(${vi_cv_var_python3_version} < 3.2)"
+       then
+         vi_cv_var_python3_abiflags=`${vi_cv_path_python3} -c \
+           "import sys; print(sys.abiflags)"`
+       fi ])
+
+      dnl -- find where python3 thinks it was installed
+      AC_CACHE_CHECK(Python's install prefix,vi_cv_path_python3_pfx,
+      [ vi_cv_path_python3_pfx=`
+       ${vi_cv_path_python3} -c \
+       "import sys; print(sys.prefix)"` ])
+
+      dnl -- and where it thinks it runs
+      AC_CACHE_CHECK(Python's execution prefix,vi_cv_path_python3_epfx,
+      [ vi_cv_path_python3_epfx=`
+       ${vi_cv_path_python3} -c \
+       "import sys; print(sys.exec_prefix)"` ])
+
+      dnl -- python3's include path
+      AC_CACHE_CHECK(Python's include path,vi_cv_path_python3_include,
+      [ vi_cv_path_python3_include=`
+       ${vi_cv_path_python3} -c \
+       "import sysconfig; print(sysconfig.get_path(\"include\"))"` ])
+
+      dnl -- python3's platform include path
+      AC_CACHE_CHECK(Python's include path,vi_cv_path_python3_platinclude,
+      [ vi_cv_path_python3_platinclude=`
+       ${vi_cv_path_python3} -c \
+       "import sysconfig; print(sysconfig.get_path(\"platinclude\"))"` ])
+
+      dnl -- python3's internal library path
+
+      AC_CACHE_VAL(vi_cv_path_python3path,
+      [ vi_cv_path_python3path=`
+       unset PYTHONPATH;
+       ${vi_cv_path_python3} -c \
+       "import sys, string; print(':'.join(sys.path))"` ])
+
+      dnl -- where the Python implementation library archives are
+
+      AC_ARG_WITH(python3-config-dir,
+       [  --with-python3-config-dir=PATH  Python's config directory (deprecated)],
+       [ vi_cv_path_python3_conf="${withval}"; have_python3_config_dir=1 ] )
+
+      AC_CACHE_CHECK(Python's configuration directory,vi_cv_path_python3_conf,
+      [
+       vi_cv_path_python3_conf=
+       config_dir="config-${vi_cv_var_python3_version}${vi_cv_var_python3_abiflags}"
+       d=`${vi_cv_path_python3} -c "import sysconfig; print(sysconfig.get_config_var('LIBPL'))" 2> /dev/null`
+       if test "x$d" = "x"; then
+         d=`${vi_cv_path_python3} -c "import distutils.sysconfig; print(distutils.sysconfig.get_config_var('LIBPL'))"`
+       fi
+       if test -d "$d" && test -f "$d/config.c"; then
+         vi_cv_path_python3_conf="$d"
+       else
+         for path in "${vi_cv_path_python3_pfx}" "${vi_cv_path_python3_epfx}"; do
+	   for subdir in lib64 lib share; do
+	     d="${path}/${subdir}/python${vi_cv_var_python3_version}/${config_dir}"
+	     if test -d "$d" && test -f "$d/config.c"; then
+	       vi_cv_path_python3_conf="$d"
+	     fi
+	   done
+         done
+       fi
+      ])
+
+      PYTHON3_CONFDIR="${vi_cv_path_python3_conf}"
+
+      if test "X$PYTHON3_CONFDIR" = "X"; then
+        AC_MSG_RESULT([can't find it!])
+      else
+
+        dnl -- we need to examine Python's config/Makefile too
+        dnl    see what the interpreter is built from
+        AC_CACHE_VAL(vi_cv_path_python3_plibs,
+        [
+            pwd=`pwd`
+            tmp_mkf="$pwd/config-PyMake$$"
+            cat -- "${PYTHON3_CONFDIR}/Makefile" - <<'eof' >"${tmp_mkf}"
+__:
+	@echo "python3_BASEMODLIBS='$(BASEMODLIBS)'"
+	@echo "python3_LIBS='$(LIBS)'"
+	@echo "python3_SYSLIBS='$(SYSLIBS)'"
+	@echo "python3_DLLLIBRARY='$(DLLLIBRARY)'"
+	@echo "python3_INSTSONAME='$(INSTSONAME)'"
+	@echo "python3_PYTHONFRAMEWORKPREFIX='$(PYTHONFRAMEWORKPREFIX)'"
+eof
+	    dnl -- delete the lines from make about Entering/Leaving directory
+	    eval "`cd ${PYTHON3_CONFDIR} && make -f "${tmp_mkf}" __ | sed '/ directory /d'`"
+	    rm -f -- "${tmp_mkf}"
+	    vi_cv_path_python3_plibs="-L${PYTHON3_CONFDIR} -lpython${vi_cv_var_python3_version}${vi_cv_var_python3_abiflags}"
+	    vi_cv_path_python3_plibs="${vi_cv_path_python3_plibs} ${python3_BASEMODLIBS} ${python3_LIBS} ${python3_SYSLIBS}"
+	    dnl remove -ltermcap, it can conflict with an earlier -lncurses
+	    vi_cv_path_python3_plibs=`echo $vi_cv_path_python3_plibs | sed s/-ltermcap//`
+	    vi_cv_path_python3_plibs=`echo $vi_cv_path_python3_plibs | sed s/-lffi//`
+	])
+	AC_CACHE_CHECK(Python3's dll name,vi_cv_dll_name_python3,
+	[
+	  if test "X$python3_DLLLIBRARY" != "X"; then
+	    vi_cv_dll_name_python3="$python3_DLLLIBRARY"
+	  elif test "X$python3_PYTHONFRAMEWORKPREFIX" != "X"; then
+	    vi_cv_dll_name_python3="${python3_PYTHONFRAMEWORKPREFIX}/${python3_INSTSONAME}"
+	  else
+	    vi_cv_dll_name_python3="$python3_INSTSONAME"
+	  fi
+	])
+
+        PYTHON3_LIBS="${vi_cv_path_python3_plibs}"
+        if test "${vi_cv_path_python3_include}" = "${vi_cv_path_python3_platinclude}"; then
+          PYTHON3_CFLAGS="-I${vi_cv_path_python3_include}"
+        else
+          PYTHON3_CFLAGS="-I${vi_cv_path_python3_include} -I${vi_cv_path_python3_platinclude}"
+        fi
+        if test "X$have_python3_config_dir" = "X1" -a "$enable_python3interp" = "dynamic"; then
+          dnl Define PYTHON3_HOME if --with-python-config-dir was used
+          PYTHON3_CFLAGS="${PYTHON3_CFLAGS}  -DPYTHON3_HOME='L\"${vi_cv_path_python3_pfx}\"'"
+        fi
+        if test "X$vi_cv_var_python3_stable_abi_hex" != "X"; then
+          PYTHON3_CFLAGS="${PYTHON3_CFLAGS} -DPy_LIMITED_API=${vi_cv_var_python3_stable_abi_hex}"
+        fi
+        PYTHON3_SRC="if_python3.c"
+        PYTHON3_OBJ="objects/if_python3.o"
+
+        dnl On FreeBSD linking with "-pthread" is required to use threads.
+        dnl _THREAD_SAFE must be used for compiling then.
+        dnl The "-pthread" is added to $LIBS, so that the following check for
+        dnl sigaltstack() will look in libc_r (it's there in libc!).
+        dnl Otherwise, when using GCC, try adding -pthread to $CFLAGS.  GCC
+        dnl will then define target-specific defines, e.g., -D_REENTRANT.
+        dnl Don't do this for Mac OSX, -pthread will generate a warning.
+        AC_MSG_CHECKING([if -pthread should be used])
+        threadsafe_flag=
+        thread_lib=
+        dnl if test "x$MACOS_X" != "xyes"; then
+        if test "$vim_cv_uname_output" != Darwin; then
+          test "$GCC" = yes && threadsafe_flag="-pthread"
+          if test "$vim_cv_uname_output" = FreeBSD; then
+            threadsafe_flag="-D_THREAD_SAFE"
+            thread_lib="-pthread"
+          fi
+          if test "$vim_cv_uname_output" = SunOS; then
+            threadsafe_flag="-pthreads"
+          fi
+        fi
+        libs_save_old=$LIBS
+        if test -n "$threadsafe_flag"; then
+          cflags_save=$CFLAGS
+          CFLAGS="$CFLAGS $threadsafe_flag"
+          LIBS="$LIBS $thread_lib"
+          AC_LINK_IFELSE([AC_LANG_PROGRAM(,[ ])],
+             AC_MSG_RESULT(yes); PYTHON3_CFLAGS="$PYTHON3_CFLAGS $threadsafe_flag",
+             AC_MSG_RESULT(no); LIBS=$libs_save_old
+             )
+          CFLAGS=$cflags_save
+        else
+          AC_MSG_RESULT(no)
+        fi
+
+        dnl check that compiling a simple program still works with the flags
+        dnl added for Python.
+        AC_MSG_CHECKING([if compile and link flags for Python 3 are sane])
+        cflags_save=$CFLAGS
+        libs_save=$LIBS
+        CFLAGS="$CFLAGS $PYTHON3_CFLAGS"
+        LIBS="$LIBS $PYTHON3_LIBS"
+        AC_LINK_IFELSE([AC_LANG_PROGRAM(,[ ])],
+               AC_MSG_RESULT(yes); python3_ok=yes,
+               AC_MSG_RESULT(no: PYTHON3 DISABLED); python3_ok=no)
+        CFLAGS=$cflags_save
+        LIBS=$libs_save
+        if test "$python3_ok" = yes; then
+          AC_DEFINE(FEAT_PYTHON3)
+        else
+          LIBS=$libs_save_old
+          PYTHON3_SRC=
+          PYTHON3_OBJ=
+          PYTHON3_LIBS=
+          PYTHON3_CFLAGS=
+        fi
+      fi
+    else
+      AC_MSG_RESULT(too old)
+    fi
+  fi
+  if test "$fail_if_missing" = "yes" -a "$python3_ok" != "yes"; then
+    AC_MSG_ERROR([could not configure python3])
+  fi
+fi
+
+AC_SUBST(PYTHON3_LIBS)
+AC_SUBST(PYTHON3_CFLAGS)
+AC_SUBST(PYTHON3_CFLAGS_EXTRA)
+AC_SUBST(PYTHON3_SRC)
+AC_SUBST(PYTHON3_OBJ)
+
+dnl if python2.x and python3.x are enabled one can only link in code
+dnl with dlopen(), dlsym(), dlclose()
+if test "$python_ok" = yes && test "$python3_ok" = yes; then
+  AC_DEFINE(DYNAMIC_PYTHON)
+  AC_DEFINE(DYNAMIC_PYTHON3)
+  if test "X$vi_cv_var_python3_stable_abi_hex" != "X"; then
+    AC_DEFINE(DYNAMIC_PYTHON3_STABLE_ABI)
+  fi
+  AC_MSG_CHECKING(whether we can do without RTLD_GLOBAL for Python)
+  cflags_save=$CFLAGS
+  CFLAGS="$CFLAGS $PYTHON_CFLAGS"
+  libs_save=$LIBS
+  dnl -ldl must go first to make this work on Archlinux (Roland Puntaier)
+  LIBS="-ldl $LIBS"
+  AC_RUN_IFELSE([AC_LANG_SOURCE([
+    #include <dlfcn.h>
+    /* If this program fails, then RTLD_GLOBAL is needed.
+     * RTLD_GLOBAL will be used and then it is not possible to
+     * have both python versions enabled in the same vim instance.
+     * Only the first python version used will be switched on.
+     */
+
+    static int no_rtl_global_needed_for(char *python_instsoname, char *prefix)
+    {
+      int needed = 0;
+      void* pylib = dlopen(python_instsoname, RTLD_LAZY|RTLD_LOCAL);
+      if (pylib != 0)
+      {
+          void (*pfx)(char *home) = dlsym(pylib, "Py_SetPythonHome");
+          void (*init)(void) = dlsym(pylib, "Py_Initialize");
+          int (*simple)(char*) = dlsym(pylib, "PyRun_SimpleString");
+          void (*final)(void) = dlsym(pylib, "Py_Finalize");
+          (*pfx)(prefix);
+          (*init)();
+          needed = (*simple)("import termios") == -1;
+          (*final)();
+          dlclose(pylib);
+      }
+      return !needed;
+    }
+
+    int main()
+    {
+      int not_needed = 0;
+      if (no_rtl_global_needed_for("${vi_cv_dll_name_python}", "${vi_cv_path_python_pfx}"))
+            not_needed = 1;
+      return !not_needed;
+    }])],
+    [AC_MSG_RESULT(yes);AC_DEFINE(PY_NO_RTLD_GLOBAL)], [AC_MSG_RESULT(no)])
+
+  CFLAGS=$cflags_save
+  LIBS=$libs_save
+
+  AC_MSG_CHECKING(whether we can do without RTLD_GLOBAL for Python3)
+  cflags_save=$CFLAGS
+  CFLAGS="$CFLAGS $PYTHON3_CFLAGS"
+  libs_save=$LIBS
+  dnl -ldl must go first to make this work on Archlinux (Roland Puntaier)
+  LIBS="-ldl $LIBS"
+  AC_RUN_IFELSE([AC_LANG_SOURCE([
+    #include <dlfcn.h>
+    #include <wchar.h>
+    /* If this program fails, then RTLD_GLOBAL is needed.
+     * RTLD_GLOBAL will be used and then it is not possible to
+     * have both python versions enabled in the same vim instance.
+     * Only the first python version used will be switched on.
+     */
+
+    static int no_rtl_global_needed_for(char *python_instsoname, wchar_t *prefix)
+    {
+      int needed = 0;
+      void* pylib = dlopen(python_instsoname, RTLD_LAZY|RTLD_LOCAL);
+      if (pylib != 0)
+      {
+          void (*pfx)(wchar_t *home) = dlsym(pylib, "Py_SetPythonHome");
+          void (*init)(void) = dlsym(pylib, "Py_Initialize");
+          int (*simple)(char*) = dlsym(pylib, "PyRun_SimpleString");
+          void (*final)(void) = dlsym(pylib, "Py_Finalize");
+          (*pfx)(prefix);
+          (*init)();
+          needed = (*simple)("import termios") == -1;
+          (*final)();
+          dlclose(pylib);
+      }
+      return !needed;
+    }
+
+    int main()
+    {
+      int not_needed = 0;
+      if (no_rtl_global_needed_for("${vi_cv_dll_name_python3}", L"${vi_cv_path_python3_pfx}"))
+            not_needed = 1;
+      return !not_needed;
+    }])],
+    [AC_MSG_RESULT(yes);AC_DEFINE(PY3_NO_RTLD_GLOBAL)], [AC_MSG_RESULT(no)])
+
+  CFLAGS=$cflags_save
+  LIBS=$libs_save
+
+  PYTHON_SRC="if_python.c"
+  PYTHON_OBJ="objects/if_python.o"
+  PYTHON_CFLAGS="$PYTHON_CFLAGS -DDYNAMIC_PYTHON_DLL=\\\"${vi_cv_dll_name_python}\\\""
+  PYTHON_LIBS=
+  PYTHON3_SRC="if_python3.c"
+  PYTHON3_OBJ="objects/if_python3.o"
+  PYTHON3_CFLAGS="$PYTHON3_CFLAGS -DDYNAMIC_PYTHON3_DLL=\\\"${vi_cv_dll_name_python3}\\\""
+  PYTHON3_LIBS=
+elif test "$python_ok" = yes && test "$enable_pythoninterp" = "dynamic"; then
+  AC_DEFINE(DYNAMIC_PYTHON)
+  PYTHON_SRC="if_python.c"
+  PYTHON_OBJ="objects/if_python.o"
+  PYTHON_CFLAGS="$PYTHON_CFLAGS -DDYNAMIC_PYTHON_DLL=\\\"${vi_cv_dll_name_python}\\\""
+  PYTHON_LIBS=
+elif test "$python_ok" = yes; then
+  dnl Check that adding -fPIE works.  It may be needed when using a static
+  dnl Python library.
+  AC_MSG_CHECKING([if -fPIE can be added for Python])
+  cflags_save=$CFLAGS
+  libs_save=$LIBS
+  CFLAGS="$CFLAGS $PYTHON_CFLAGS -fPIE"
+  LIBS="$LIBS $PYTHON_LIBS"
+  AC_LINK_IFELSE([AC_LANG_PROGRAM(,[ ])],
+	 AC_MSG_RESULT(yes); fpie_ok=yes,
+	 AC_MSG_RESULT(no); fpie_ok=no)
+  CFLAGS=$cflags_save
+  LIBS=$libs_save
+  if test $fpie_ok = yes; then
+    PYTHON_CFLAGS="$PYTHON_CFLAGS -fPIE"
+  fi
+elif test "$python3_ok" = yes && test "$enable_python3interp" = "dynamic"; then
+  AC_DEFINE(DYNAMIC_PYTHON3)
+  if test "X$vi_cv_var_python3_stable_abi_hex" != "X"; then
+    AC_DEFINE(DYNAMIC_PYTHON3_STABLE_ABI)
+  fi
+  PYTHON3_SRC="if_python3.c"
+  PYTHON3_OBJ="objects/if_python3.o"
+  PYTHON3_CFLAGS="$PYTHON3_CFLAGS -DDYNAMIC_PYTHON3_DLL=\\\"${vi_cv_dll_name_python3}\\\""
+  PYTHON3_LIBS=
+elif test "$python3_ok" = yes; then
+  dnl Check that adding -fPIE works.  It may be needed when using a static
+  dnl Python library.
+  AC_MSG_CHECKING([if -fPIE can be added for Python3])
+  cflags_save=$CFLAGS
+  libs_save=$LIBS
+  CFLAGS="$CFLAGS $PYTHON3_CFLAGS -fPIE"
+  LIBS="$LIBS $PYTHON3_LIBS"
+  AC_LINK_IFELSE([AC_LANG_PROGRAM(,[ ])],
+	 AC_MSG_RESULT(yes); fpie_ok=yes,
+	 AC_MSG_RESULT(no); fpie_ok=no)
+  CFLAGS=$cflags_save
+  LIBS=$libs_save
+  if test $fpie_ok = yes; then
+    PYTHON3_CFLAGS="$PYTHON3_CFLAGS -fPIE"
+  fi
+fi
+
+AC_MSG_CHECKING(--enable-tclinterp argument)
+AC_ARG_ENABLE(tclinterp,
+	[  --enable-tclinterp[=OPTS]      Include Tcl interpreter. [default=no] [OPTS=no/yes/dynamic]], ,
+	[enable_tclinterp="no"])
+AC_MSG_RESULT($enable_tclinterp)
+
+if test "$enable_tclinterp" = "yes" -o "$enable_tclinterp" = "dynamic"; then
+
+  dnl on FreeBSD tclsh is a silly script, look for tclsh8.[5420]
+  AC_MSG_CHECKING(--with-tclsh argument)
+  AC_ARG_WITH(tclsh, [  --with-tclsh=PATH       which tclsh to use (default: tclsh8.0)],
+	tclsh_name="$withval"; AC_MSG_RESULT($tclsh_name),
+	tclsh_name="tclsh8.5"; AC_MSG_RESULT(no))
+  AC_PATH_PROG(vi_cv_path_tcl, $tclsh_name)
+  AC_SUBST(vi_cv_path_tcl)
+
+  dnl when no specific version specified, also try 8.4, 8.2 and 8.0
+  if test "X$vi_cv_path_tcl" = "X" -a $tclsh_name = "tclsh8.5"; then
+    tclsh_name="tclsh8.4"
+    AC_PATH_PROG(vi_cv_path_tcl, $tclsh_name)
+  fi
+  if test "X$vi_cv_path_tcl" = "X" -a $tclsh_name = "tclsh8.4"; then
+    tclsh_name="tclsh8.2"
+    AC_PATH_PROG(vi_cv_path_tcl, $tclsh_name)
+  fi
+  if test "X$vi_cv_path_tcl" = "X" -a $tclsh_name = "tclsh8.2"; then
+    tclsh_name="tclsh8.0"
+    AC_PATH_PROG(vi_cv_path_tcl, $tclsh_name)
+  fi
+  dnl still didn't find it, try without version number
+  if test "X$vi_cv_path_tcl" = "X"; then
+    tclsh_name="tclsh"
+    AC_PATH_PROG(vi_cv_path_tcl, $tclsh_name)
+  fi
+  if test "X$vi_cv_path_tcl" != "X"; then
+    AC_MSG_CHECKING(Tcl version)
+    if echo 'exit [[expr [info tclversion] < 8.0]]' | "$vi_cv_path_tcl" - ; then
+      tclver=`echo 'puts [[info tclversion]]' | $vi_cv_path_tcl -`
+      AC_MSG_RESULT($tclver - OK);
+      tclloc=`echo 'set l [[info library]];set i [[string last lib $l]];incr i -2;puts [[string range $l 0 $i]]' | $vi_cv_path_tcl -`
+      tcldll=`echo 'puts libtcl[[info tclversion]][[info sharedlibextension]]' | $vi_cv_path_tcl -`
+
+      AC_MSG_CHECKING(for location of Tcl include)
+      if test "x$MACOS_X" != "xyes"; then
+	tclinc="$tclloc/include $tclloc/include/tcl $tclloc/include/tcl$tclver /usr/local/include /usr/local/include/tcl$tclver /usr/include /usr/include/tcl$tclver"
+      else
+	dnl For all macOS, use the value from TCL in case use of, say, homebrew
+	dnl For Mac OS X 10.3, use the OS-provided framework location
+	dnl For Mac OS X 10.14, the OS-provided framework location doesn't contain the headers, so also check the Xcode SDK
+	tclinc="$tclloc/include $tclloc/include/tcl $tclloc/include/tcl$tclver /System/Library/Frameworks/Tcl.framework/Headers `xcrun --show-sdk-path`/System/Library/Frameworks/Tcl.framework/Versions/Current/Headers"
+      fi
+      TCL_INC=
+      for try in $tclinc; do
+	if test -f "$try/tcl.h"; then
+	  AC_MSG_RESULT($try/tcl.h)
+	  TCL_INC=$try
+	  break
+	fi
+      done
+      if test -z "$TCL_INC"; then
+	AC_MSG_RESULT(<not found>)
+	SKIP_TCL=YES
+      fi
+      if test -z "$SKIP_TCL"; then
+	AC_MSG_CHECKING(for location of tclConfig.sh script)
+	if test "x$MACOS_X" != "xyes"; then
+	  tclcnf=`echo $tclinc | sed s/include/lib/g`
+	  tclcnf="$tclcnf `echo $tclinc | sed s/include/lib64/g`"
+	else
+	  dnl For all macOS, use the value from TCL in case use of, say, homebrew
+	  dnl For Mac OS X 10.3, use the OS-provided framework location
+	  dnl For Mac OS X 10.14, the OS-provided framework location doesn't contain the headers, so also check the Xcode SDK
+	  tclcnf=`echo $tclinc | sed s/include/lib/g`
+	  tclcnf="$tclcnf /System/Library/Frameworks/Tcl.framework `xcrun --show-sdk-path`/System/Library/Frameworks/Tcl.framework"
+	fi
+	for try in $tclcnf; do
+	  if test -f "$try/tclConfig.sh"; then
+	    AC_MSG_RESULT($try/tclConfig.sh)
+	    . "$try/tclConfig.sh"
+	    dnl use eval, because tcl 8.2 includes ${TCL_DBGX}
+	    if test "$enable_tclinterp" = "dynamic"; then
+	      TCL_LIBS=`eval echo "$TCL_STUB_LIB_SPEC $TCL_LIBS"`
+	    else
+	      TCL_LIBS=`eval echo "$TCL_LIB_SPEC $TCL_LIBS"`
+	    fi
+	    dnl Use $TCL_DEFS for -D_THREAD_SAFE et al.  But only use the
+	    dnl "-D_ABC" items.  Watch out for -DFOO=long\ long.
+	    TCL_DEFS=`echo $TCL_DEFS | sed -e 's/\\\\ /\\\\X/g' | tr ' ' '\012' | sed -e '/^[[^-]]/d' -e '/^-[[^D]]/d' -e '/-D[[^_]]/d' -e 's/-D_/ -D_/' | tr '\012' ' ' | sed -e 's/\\\\X/\\\\ /g'`
+	    break
+	  fi
+	done
+	if test -z "$TCL_LIBS"; then
+	  AC_MSG_RESULT(<not found>)
+	  AC_MSG_CHECKING(for Tcl library by myself)
+	  tcllib=`echo $tclinc | sed s/include/lib/g`
+	  tcllib="$tcllib `echo $tclinc | sed s/include/lib64/g`"
+	  for ext in .so .a ; do
+	    for ver in "" $tclver ; do
+	      for try in $tcllib ; do
+		trylib=tcl$ver$ext
+		if test -f "$try/lib$trylib" ; then
+		  AC_MSG_RESULT($try/lib$trylib)
+		  TCL_LIBS="-L\"$try\" -ltcl$ver -ldl -lm"
+		  if test "$vim_cv_uname_output" = SunOS &&
+					 echo $vim_cv_uname_r_output | grep '^5' >/dev/null; then
+		    TCL_LIBS="$TCL_LIBS -R $try"
+		  fi
+		  break 3
+		fi
+	      done
+	    done
+	  done
+	  if test -z "$TCL_LIBS"; then
+	    AC_MSG_RESULT(<not found>)
+	    SKIP_TCL=YES
+	  fi
+	fi
+	if test -z "$SKIP_TCL"; then
+	  AC_DEFINE(FEAT_TCL)
+	  TCL_SRC=if_tcl.c
+	  TCL_OBJ=objects/if_tcl.o
+	  TCL_PRO=if_tcl.pro
+	  TCL_CFLAGS="-I$TCL_INC $TCL_DEFS"
+	fi
+      fi
+    else
+      AC_MSG_RESULT(too old; need Tcl version 8.0 or later)
+    fi
+  fi
+  if test "$enable_tclinterp" = "dynamic"; then
+    if test "X$TCL_SRC" != "X" -a "X$tcldll" != "X"; then
+      AC_DEFINE(DYNAMIC_TCL)
+      TCL_CFLAGS="-DDYNAMIC_TCL_DLL=\\\"$tcldll\\\" -DDYNAMIC_TCL_VER=\\\"$tclver\\\" $TCL_CFLAGS"
+    fi
+  fi
+  if test "$fail_if_missing" = "yes" -a -z "$TCL_SRC"; then
+    AC_MSG_ERROR([could not configure Tcl])
+  fi
+fi
+AC_SUBST(TCL_SRC)
+AC_SUBST(TCL_OBJ)
+AC_SUBST(TCL_PRO)
+AC_SUBST(TCL_CFLAGS)
+AC_SUBST(TCL_CFLAGS_EXTRA)
+AC_SUBST(TCL_LIBS)
+
+AC_MSG_CHECKING(--enable-rubyinterp argument)
+AC_ARG_ENABLE(rubyinterp,
+	[  --enable-rubyinterp[=OPTS]     Include Ruby interpreter.  [default=no] [OPTS=no/yes/dynamic]], ,
+	[enable_rubyinterp="no"])
+AC_MSG_RESULT($enable_rubyinterp)
+if test "$enable_rubyinterp" = "yes" -o "$enable_rubyinterp" = "dynamic"; then
+  if test "$has_eval" = "no"; then
+    AC_MSG_ERROR([cannot use Ruby with tiny features])
+  fi
+
+  AC_MSG_CHECKING(--with-ruby-command argument)
+  AC_SUBST(vi_cv_path_ruby)
+  AC_ARG_WITH(ruby-command, [  --with-ruby-command=RUBY  name of the Ruby command (default: ruby)],
+	RUBY_CMD="$withval"; vi_cv_path_ruby="$withval"; AC_MSG_RESULT($RUBY_CMD),
+	RUBY_CMD="ruby"; AC_MSG_RESULT(defaulting to $RUBY_CMD))
+  AC_PATH_PROG(vi_cv_path_ruby, $RUBY_CMD)
+  if test "X$vi_cv_path_ruby" != "X"; then
+    AC_MSG_CHECKING(Ruby version)
+    if $vi_cv_path_ruby -e 'RUBY_VERSION >= "1.9.1" or exit 1' >/dev/null 2>/dev/null; then
+      AC_MSG_RESULT(OK)
+      AC_MSG_CHECKING(Ruby rbconfig)
+      ruby_rbconfig="RbConfig"
+      if ! $vi_cv_path_ruby -r rbconfig -e 'RbConfig' >/dev/null 2>/dev/null; then
+	ruby_rbconfig="Config"
+      fi
+      AC_MSG_RESULT($ruby_rbconfig)
+      AC_MSG_CHECKING(Ruby header files)
+      rubyhdrdir=`$vi_cv_path_ruby -r mkmf -e "print $ruby_rbconfig::CONFIG[['rubyhdrdir']] || $ruby_rbconfig::CONFIG[['archdir']] || \\$hdrdir" 2>/dev/null`
+      if test "X$rubyhdrdir" != "X"; then
+	AC_MSG_RESULT($rubyhdrdir)
+	RUBY_CFLAGS="-I$rubyhdrdir"
+        rubyarchdir=`$vi_cv_path_ruby -r rbconfig -e "print ($ruby_rbconfig::CONFIG.has_key? 'rubyarchhdrdir') ? $ruby_rbconfig::CONFIG[['rubyarchhdrdir']] : '$rubyhdrdir/'+$ruby_rbconfig::CONFIG[['arch']]"`
+        if test -d "$rubyarchdir"; then
+          RUBY_CFLAGS="$RUBY_CFLAGS -I$rubyarchdir"
+        fi
+        rubyversion=`$vi_cv_path_ruby -r rbconfig -e "print $ruby_rbconfig::CONFIG[['ruby_version']].gsub(/\./, '')[[0,2]]"`
+	if test "X$rubyversion" = "X"; then
+	  rubyversion=`$vi_cv_path_ruby -e "print RUBY_VERSION.gsub(/\./, '')[[0,2]]"`
+	fi
+        RUBY_CFLAGS="$RUBY_CFLAGS -DRUBY_VERSION=$rubyversion"
+	rubylibs=`$vi_cv_path_ruby -r rbconfig -e "print $ruby_rbconfig::CONFIG[['LIBS']]"`
+	if test "X$rubylibs" != "X"; then
+	  RUBY_LIBS="$rubylibs"
+	fi
+	librubyarg=`$vi_cv_path_ruby -r rbconfig -e "print $ruby_rbconfig.expand($ruby_rbconfig::CONFIG[['LIBRUBYARG']])"`
+	librubya=`$vi_cv_path_ruby -r rbconfig -e "print $ruby_rbconfig.expand($ruby_rbconfig::CONFIG[['LIBRUBY_A']])"`
+	rubylibdir=`$vi_cv_path_ruby -r rbconfig -e "print $ruby_rbconfig.expand($ruby_rbconfig::CONFIG[['libdir']])"`
+	if test -f "$rubylibdir/$librubya" || expr "$librubyarg" : "-lruby" >/dev/null; then
+	  RUBY_LIBS="$RUBY_LIBS -L$rubylibdir"
+	elif test "$librubyarg" = "libruby.a"; then
+	  dnl required on Mac OS 10.3 where libruby.a doesn't exist
+	  librubyarg="-lruby"
+	  RUBY_LIBS="$RUBY_LIBS -L$rubylibdir"
+	fi
+
+	if test "X$librubyarg" != "X"; then
+	  RUBY_LIBS="$librubyarg $RUBY_LIBS"
+	fi
+
+	dnl Here the Ruby LDFLAGS used to be added to LDFLAGS, but that turns
+	dnl out to cause trouble and was removed.
+
+	RUBY_SRC="if_ruby.c"
+	RUBY_OBJ="objects/if_ruby.o"
+	RUBY_PRO="if_ruby.pro"
+	AC_DEFINE(FEAT_RUBY)
+	if test "$enable_rubyinterp" = "dynamic"; then
+	  libruby_soname=`$vi_cv_path_ruby -r rbconfig -e "puts $ruby_rbconfig::CONFIG[['LIBRUBY_ALIASES']].split[[0]]"`
+	  if test -z "$libruby_soname"; then
+	    libruby_soname=`$vi_cv_path_ruby -r rbconfig -e "puts $ruby_rbconfig::CONFIG[['LIBRUBY_SO']]"`
+	  fi
+	  AC_DEFINE(DYNAMIC_RUBY)
+	  RUBY_CFLAGS="-DDYNAMIC_RUBY_DLL=\\\"$libruby_soname\\\" $RUBY_CFLAGS"
+	  RUBY_LIBS=
+	fi
+	if test "X$CLANG_VERSION" != "X" -a "$rubyversion" -ge 30; then
+	  RUBY_CFLAGS="$RUBY_CFLAGS -fdeclspec"
+	fi
+      else
+	AC_MSG_RESULT(not found; disabling Ruby)
+      fi
+    else
+      AC_MSG_RESULT(too old; need Ruby version 1.9.1 or later)
+    fi
+  fi
+
+  if test "$fail_if_missing" = "yes" -a -z "$RUBY_OBJ"; then
+    AC_MSG_ERROR([could not configure Ruby])
+  fi
+fi
+AC_SUBST(RUBY_SRC)
+AC_SUBST(RUBY_OBJ)
+AC_SUBST(RUBY_PRO)
+AC_SUBST(RUBY_CFLAGS)
+AC_SUBST(RUBY_CFLAGS_EXTRA)
+AC_SUBST(RUBY_LIBS)
+
+AC_MSG_CHECKING(--enable-cscope argument)
+AC_ARG_ENABLE(cscope,
+	[  --enable-cscope         Include cscope interface.], ,
+	[enable_cscope="no"])
+AC_MSG_RESULT($enable_cscope)
+if test "$enable_cscope" = "yes"; then
+  AC_DEFINE(FEAT_CSCOPE)
+fi
+
+AC_MSG_CHECKING(--disable-netbeans argument)
+AC_ARG_ENABLE(netbeans,
+	[  --disable-netbeans      Disable NetBeans integration support.],
+	, [enable_netbeans="yes"])
+if test "$enable_netbeans" = "yes"; then
+  if test "$has_eval" = "no"; then
+    AC_MSG_RESULT([cannot use NetBeans with tiny features])
+    enable_netbeans="no"
+  else
+    AC_MSG_RESULT(no)
+  fi
+else
+  AC_MSG_RESULT(yes)
+fi
+
+AC_MSG_CHECKING(--disable-channel argument)
+AC_ARG_ENABLE(channel,
+	[  --disable-channel       Disable process communication support.],
+	, [enable_channel="yes"])
+if test "$enable_channel" = "yes"; then
+  if test "$has_eval" = "no"; then
+    AC_MSG_RESULT([cannot use channels with tiny features])
+    enable_channel="no"
+  else
+    AC_MSG_RESULT(no)
+  fi
+else
+  if test "$enable_netbeans" = "yes"; then
+    AC_MSG_RESULT([yes, netbeans also disabled])
+    enable_netbeans="no"
+  else
+    AC_MSG_RESULT(yes)
+  fi
+fi
+
+if test "$enable_channel" = "yes"; then
+  dnl On Solaris we need the socket library, or on Haiku the network library.
+  if test "x$HAIKU" = "xyes"; then
+	AC_CHECK_LIB(network, socket)
+  else
+	AC_CHECK_LIB(socket, socket)
+  fi
+
+  AC_CACHE_CHECK([whether compiling with IPv6 networking is possible], [vim_cv_ipv6_networking],
+    [AC_LINK_IFELSE([AC_LANG_PROGRAM([
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <fcntl.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+	/* Check bitfields */
+	struct nbbuf {
+	unsigned int  initDone:1;
+	unsigned short signmaplen;
+	};
+	    ], [
+		/* Check creating a socket. */
+		struct sockaddr_in server;
+		struct addrinfo *res;
+		(void)socket(AF_INET, SOCK_STREAM, 0);
+		(void)htons(100);
+		(void)getaddrinfo("microsoft.com", NULL, NULL, &res);
+		if (errno == ECONNREFUSED)
+		  (void)connect(1, (struct sockaddr *)&server, sizeof(server));
+		(void)freeaddrinfo(res);
+	    ])],
+	[vim_cv_ipv6_networking="yes"],
+	[vim_cv_ipv6_networking="no"])])
+
+  if test "x$vim_cv_ipv6_networking" = "xyes"; then
+    AC_DEFINE(FEAT_IPV6)
+    AC_CHECK_FUNCS(inet_ntop)
+  else
+    dnl On Solaris we need the nsl library.
+    AC_CHECK_LIB(nsl, gethostbyname)
+    AC_CACHE_CHECK([whether compiling with IPv4 networking is possible], [vim_cv_ipv4_networking],
+      [AC_LINK_IFELSE([AC_LANG_PROGRAM([
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <fcntl.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+	/* Check bitfields */
+	struct nbbuf {
+	unsigned int  initDone:1;
+	unsigned short signmaplen;
+	};
+	    ], [
+		/* Check creating a socket. */
+		struct sockaddr_in server;
+		(void)socket(AF_INET, SOCK_STREAM, 0);
+		(void)htons(100);
+		(void)gethostbyname("microsoft.com");
+		if (errno == ECONNREFUSED)
+		  (void)connect(1, (struct sockaddr *)&server, sizeof(server));
+	    ])],
+	[vim_cv_ipv4_networking="yes"],
+	[vim_cv_ipv4_networking="no"; enable_netbeans="no"; enable_channel="no"])])
+  fi
+fi
+if test "$enable_netbeans" = "yes"; then
+  AC_DEFINE(FEAT_NETBEANS_INTG)
+  NETBEANS_SRC="netbeans.c"
+  AC_SUBST(NETBEANS_SRC)
+  NETBEANS_OBJ="objects/netbeans.o"
+  AC_SUBST(NETBEANS_OBJ)
+fi
+if test "$enable_channel" = "yes"; then
+  AC_DEFINE(FEAT_JOB_CHANNEL)
+  CHANNEL_SRC="job.c channel.c"
+  AC_SUBST(CHANNEL_SRC)
+  CHANNEL_OBJ="objects/job.o objects/channel.o"
+  AC_SUBST(CHANNEL_OBJ)
+fi
+
+AC_MSG_CHECKING(--enable-terminal argument)
+AC_ARG_ENABLE(terminal,
+	[  --enable-terminal       Enable terminal emulation support.],
+	, [enable_terminal="auto"])
+if test "$enable_terminal" = "yes" || test "$enable_terminal" = "auto" -a "x$features" = "xhuge" ; then
+  if test "$has_eval" = "no"; then
+    AC_MSG_RESULT([cannot use terminal emulator with tiny features])
+    enable_terminal="no"
+  else
+    if test "$enable_terminal" = "auto"; then
+      enable_terminal="yes"
+      AC_MSG_RESULT(defaulting to yes)
+    else
+      AC_MSG_RESULT(yes)
+    fi
+  fi
+else
+  if test "$enable_terminal" = "auto"; then
+    enable_terminal="no"
+    AC_MSG_RESULT(defaulting to no)
+  else
+    AC_MSG_RESULT(no)
+  fi
+fi
+if test "$enable_terminal" = "yes" -a "$enable_channel" = "yes"; then
+  AC_DEFINE(FEAT_TERMINAL)
+  TERM_SRC="libvterm/src/encoding.c libvterm/src/keyboard.c libvterm/src/mouse.c libvterm/src/parser.c libvterm/src/pen.c libvterm/src/creen.c libvterm/src/state.c libvterm/src/unicode.c libvterm/src/vterm.c"
+  AC_SUBST(TERM_SRC)
+  TERM_OBJ="objects/vterm_encoding.o objects/vterm_keyboard.o objects/vterm_mouse.o objects/vterm_parser.o objects/vterm_pen.o objects/vterm_screen.o objects/vterm_state.o objects/vterm_unicode.o objects/vterm_vterm.o"
+  AC_SUBST(TERM_OBJ)
+  TERM_TEST="test_libvterm"
+  AC_SUBST(TERM_TEST)
+fi
+
+AC_MSG_CHECKING(--enable-autoservername argument)
+AC_ARG_ENABLE(autoservername,
+	[  --enable-autoservername Automatically define servername at vim startup.], ,
+	[enable_autoservername="no"])
+AC_MSG_RESULT($enable_autoservername)
+if test "$enable_autoservername" = "yes"; then
+  AC_DEFINE(FEAT_AUTOSERVERNAME)
+fi
+
+AC_MSG_CHECKING(--enable-multibyte argument)
+AC_ARG_ENABLE(multibyte,
+	[  --enable-multibyte      Include multibyte editing support.], ,
+	[enable_multibyte="yes"])
+AC_MSG_RESULT($enable_multibyte)
+if test "$enable_multibyte" != "yes"; then
+  AC_MSG_ERROR([The multi-byte feature can no longer be disabled. If you have
+		a problem with this, discuss on the Vim mailing list.])
+fi
+
+dnl Right-to-Left language support for Vim will be included with huge features,
+dnl unless ENABLE_RIGHTLEFT is undefined.
+AC_MSG_CHECKING(--disable-rightleft argument)
+AC_ARG_ENABLE(rightleft,
+	[  --disable-rightleft     Do not include Right-to-Left language support.],
+	, [enable_rightleft="yes"])
+if test "$enable_rightleft" = "yes"; then
+	AC_MSG_RESULT(no)
+else
+	AC_MSG_RESULT(yes)
+	AC_DEFINE(DISABLE_RIGHTLEFT)
+fi
+
+dnl Arabic language support for Vim will be included with huge features,
+dnl unless ENABLE_ARABIC is undefined.
+AC_MSG_CHECKING(--disable-arabic argument)
+AC_ARG_ENABLE(arabic,
+	[  --disable-arabic        Do not include Arabic language support.],
+	, [enable_arabic="yes"])
+if test "$enable_arabic" = "yes"; then
+	AC_MSG_RESULT(no)
+else
+	AC_MSG_RESULT(yes)
+	AC_DEFINE(DISABLE_ARABIC)
+fi
+
+dnl Farsi language support has been removed, ignore --disable-farsi
+AC_ARG_ENABLE(farsi,
+	[  --disable-farsi         Deprecated.],,)
+
+AC_MSG_CHECKING(--enable-xim argument)
+AC_ARG_ENABLE(xim,
+	[  --enable-xim            Include XIM input support.],
+	AC_MSG_RESULT($enable_xim),
+	[enable_xim="auto"; AC_MSG_RESULT(defaulting to auto)])
+
+AC_MSG_CHECKING(--enable-fontset argument)
+AC_ARG_ENABLE(fontset,
+	[  --enable-fontset        Include X fontset output support.], ,
+	[enable_fontset="no"])
+AC_MSG_RESULT($enable_fontset)
+dnl defining FEAT_XFONTSET is delayed, so that it can be disabled for no GUI
+
+test -z "$with_x" && with_x=yes
+test "${enable_gui-yes}" != no -a "x$MACOS_X" != "xyes" -a "x$QNX" != "xyes" && with_x=yes
+if test "$with_x" = no; then
+  AC_MSG_RESULT(defaulting to: don't HAVE_X11)
+else
+  dnl Do this check early, so that its failure can override user requests.
+
+  AC_PATH_PROG(xmkmfpath, xmkmf)
+
+  AC_PATH_XTRA
+
+  dnl On z/OS Unix the X libraries are DLLs. To use them the code must
+  dnl be compiled with a special option.
+  dnl Also add SM, ICE and Xmu to X_EXTRA_LIBS.
+  if test "$zOSUnix" = "yes"; then
+    CFLAGS="$CFLAGS -W c,dll"
+    LDFLAGS="$LDFLAGS -W l,dll"
+    X_EXTRA_LIBS="$X_EXTRA_LIBS -lSM -lICE -lXmu"
+  fi
+
+  dnl On my HPUX system the X include dir is found, but the lib dir not.
+  dnl This is a desperate try to fix this.
+
+  if test -d "$x_includes" && test ! -d "$x_libraries"; then
+    x_libraries=`echo "$x_includes" | sed s/include/lib/`
+    AC_MSG_RESULT(Corrected X libraries to $x_libraries)
+    X_LIBS="$X_LIBS -L$x_libraries"
+    if test "$vim_cv_uname_output" = SunOS &&
+					 echo $vim_cv_uname_r_output | grep '^5' >/dev/null; then
+      X_LIBS="$X_LIBS -R $x_libraries"
+    fi
+  fi
+
+  if test -d "$x_libraries" && test ! -d "$x_includes"; then
+    x_includes=`echo "$x_libraries" | sed s/lib/include/`
+    AC_MSG_RESULT(Corrected X includes to $x_includes)
+    X_CFLAGS="$X_CFLAGS -I$x_includes"
+  fi
+
+  dnl Remove "-I/usr/include " from X_CFLAGS, should not be needed.
+  X_CFLAGS="`echo $X_CFLAGS\  | sed 's%-I/usr/include %%'`"
+  dnl Remove "-L/usr/lib " from X_LIBS, should not be needed.
+  X_LIBS="`echo $X_LIBS\  | sed 's%-L/usr/lib %%'`"
+  dnl Same for "-R/usr/lib ".
+  X_LIBS="`echo $X_LIBS\  | sed -e 's%-R/usr/lib %%' -e 's%-R /usr/lib %%'`"
+
+
+  dnl Check if the X11 header files are correctly installed. On some systems
+  dnl Xlib.h includes files that don't exist.  On some systems X11/Intrinsic.h
+  dnl is missing.
+  AC_MSG_CHECKING(if X11 header files can be found)
+  cflags_save=$CFLAGS
+  CFLAGS="$CFLAGS $X_CFLAGS"
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <X11/Xlib.h>
+#include <X11/Intrinsic.h>], )],
+	AC_MSG_RESULT(yes),
+	AC_MSG_RESULT(no); no_x=yes)
+  CFLAGS=$cflags_save
+
+  if test "${no_x-no}" = yes; then
+    with_x=no
+  else
+    AC_DEFINE(HAVE_X11)
+    X_LIB="-lXt -lX11";
+    AC_SUBST(X_LIB)
+
+    ac_save_LDFLAGS="$LDFLAGS"
+    LDFLAGS="-L$x_libraries $LDFLAGS"
+
+    dnl Check for -lXdmcp (needed on SunOS 4.1.4)
+    dnl For HP-UX 10.20 it must be before -lSM -lICE
+    AC_CHECK_LIB(Xdmcp, _XdmcpAuthDoIt, [X_EXTRA_LIBS="$X_EXTRA_LIBS -lXdmcp"],,
+		[-lXt $X_PRE_LIBS -lX11 $X_EXTRA_LIBS -lXdmcp])
+
+    dnl Some systems need -lnsl -lsocket when testing for ICE.
+    dnl The check above doesn't do this, try here (again).  Also needed to get
+    dnl them after Xdmcp.  link.sh will remove them when not needed.
+    dnl Check for other function than above to avoid the cached value
+    AC_CHECK_LIB(ICE, IceOpenConnection,
+		  [X_EXTRA_LIBS="$X_EXTRA_LIBS -lSM -lICE"],, [$X_EXTRA_LIBS])
+
+    dnl Check for -lXpm (needed for some versions of Motif)
+    LDFLAGS="$X_LIBS $ac_save_LDFLAGS"
+    AC_CHECK_LIB(Xpm, XpmCreatePixmapFromData, [X_PRE_LIBS="$X_PRE_LIBS -lXpm"],,
+		[-lXt $X_PRE_LIBS -lXpm -lX11 $X_EXTRA_LIBS])
+
+    dnl Check that the X11 header files don't use implicit declarations
+    AC_MSG_CHECKING(if X11 header files implicitly declare return values)
+    cflags_save=$CFLAGS
+    dnl -Werror is GCC only, others like Solaris Studio might not like it
+    if test "$GCC" = yes; then
+      CFLAGS="$CFLAGS $X_CFLAGS -Werror"
+    else
+      CFLAGS="$CFLAGS $X_CFLAGS"
+    fi
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <X11/Xlib.h>], )],
+	AC_MSG_RESULT(no),
+	CFLAGS="$CFLAGS -Wno-implicit-int"
+	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <X11/Xlib.h>], )],
+	    AC_MSG_RESULT(yes); cflags_save="$cflags_save -Wno-implicit-int",
+	    AC_MSG_RESULT(test failed)
+	)
+    )
+    CFLAGS=$cflags_save
+
+    LDFLAGS="$ac_save_LDFLAGS"
+
+    AC_CHECK_SIZEOF([wchar_t])
+    if test "$ac_cv_sizeof_wchar_t" -le 2; then
+      AC_DEFINE(SMALL_WCHAR_T)
+    fi
+
+  fi
+fi
+
+dnl Check if --with-x was given but it doesn't work.
+if test "x$with_x" = xno -a "x$with_x_arg" = xyes; then
+    AC_MSG_ERROR([could not configure X])
+fi
+
+test "x$with_x" = xno -a "x$HAIKU" != "xyes" -a "x$MACOS_X" != "xyes" -a "x$QNX" != "xyes" && enable_gui=no
+
+AC_MSG_CHECKING(--enable-gui argument)
+AC_ARG_ENABLE(gui,
+ [  --enable-gui[=OPTS]       X11 GUI. [default=auto] [OPTS=auto/no/gtk2/gnome2/gtk3/motif/haiku/photon/carbon]], , enable_gui="auto")
+
+dnl Canonicalize the --enable-gui= argument so that it can be easily compared.
+dnl Do not use character classes for portability with old tools.
+enable_gui_canon=`echo "_$enable_gui" | \
+	sed 's/[[ _+-]]//g;y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/'`
+
+dnl Skip everything by default.
+SKIP_GTK2=YES
+SKIP_GTK3=YES
+SKIP_GNOME=YES
+SKIP_MOTIF=YES
+SKIP_PHOTON=YES
+SKIP_HAIKU=YES
+GUITYPE=NONE
+
+if test "x$HAIKU" = "xyes"; then
+  SKIP_HAIKU=
+  case "$enable_gui_canon" in
+    no)     AC_MSG_RESULT(no GUI support)
+            SKIP_HAIKU=YES ;;
+    yes|"") AC_MSG_RESULT(yes - automatic GUI support) ;;
+    auto)   AC_MSG_RESULT(auto - automatic GUI support) ;;
+    haiku)  AC_MSG_RESULT(Haiku GUI support) ;;
+    *)      AC_MSG_RESULT([Sorry, $enable_gui GUI is not supported])
+            SKIP_HAIKU=YES ;;
+    esac
+elif test "x$QNX" = "xyes" -a "x$with_x" = "xno" ; then
+  SKIP_PHOTON=
+  case "$enable_gui_canon" in
+    no)		AC_MSG_RESULT(no GUI support)
+		SKIP_PHOTON=YES ;;
+    yes|""|auto) AC_MSG_RESULT(automatic GUI support)
+    		gui_auto=yes ;;
+    photon)	AC_MSG_RESULT(Photon GUI support) ;;
+    *)		AC_MSG_RESULT([Sorry, $enable_gui GUI is not supported])
+		SKIP_PHOTON=YES ;;
+  esac
+
+elif test "x$MACOS_X" = "xyes" -a "x$with_x" = "xno" ; then
+  case "$enable_gui_canon" in
+    no)		AC_MSG_RESULT(no GUI support) ;;
+    yes|"")	AC_MSG_RESULT(yes - automatic GUI support)
+    		gui_auto=yes ;;
+    auto)	AC_MSG_RESULT(auto - disable GUI support for Mac OS) ;;
+    *)		AC_MSG_RESULT([Sorry, $enable_gui GUI is not supported]) ;;
+  esac
+else
+
+  case "$enable_gui_canon" in
+    no|none)	AC_MSG_RESULT(no GUI support) ;;
+    yes|""|auto)	AC_MSG_RESULT(yes/auto - automatic GUI support)
+		gui_auto=yes
+		SKIP_GTK2=
+		SKIP_GTK3=
+		SKIP_GNOME=
+		SKIP_MOTIF=;;
+    gtk2)	AC_MSG_RESULT(GTK+ 2.x GUI support)
+		SKIP_GTK2=;;
+    gnome2)	AC_MSG_RESULT(GNOME 2.x GUI support)
+		SKIP_GNOME=
+		SKIP_GTK2=;;
+    gtk3)	AC_MSG_RESULT(GTK+ 3.x GUI support)
+		SKIP_GTK3=;;
+    motif)	AC_MSG_RESULT(Motif GUI support)
+		SKIP_MOTIF=;;
+    *)		AC_MSG_RESULT([Sorry, $enable_gui GUI is not supported]) ;;
+  esac
+
+fi
+
+if test "x$SKIP_GTK2" != "xYES" -a "$enable_gui_canon" != "gtk2" \
+				-a "$enable_gui_canon" != "gnome2"; then
+  AC_MSG_CHECKING(whether or not to look for GTK+ 2)
+  AC_ARG_ENABLE(gtk2-check,
+	[  --enable-gtk2-check     If auto-select GUI, check for GTK+ 2 [default=yes]],
+	, enable_gtk2_check="yes")
+  AC_MSG_RESULT($enable_gtk2_check)
+  if test "x$enable_gtk2_check" = "xno"; then
+    SKIP_GTK2=YES
+    SKIP_GNOME=YES
+  fi
+fi
+
+if test "x$SKIP_GNOME" != "xYES" -a "$enable_gui_canon" != "gnome2"; then
+  AC_MSG_CHECKING(whether or not to look for GNOME)
+  AC_ARG_ENABLE(gnome-check,
+	[  --enable-gnome-check    If GTK GUI, check for GNOME [default=no]],
+	, enable_gnome_check="no")
+  AC_MSG_RESULT($enable_gnome_check)
+  if test "x$enable_gnome_check" = "xno"; then
+    SKIP_GNOME=YES
+  fi
+fi
+
+if test "x$SKIP_GTK3" != "xYES" -a "$enable_gui_canon" != "gtk3"; then
+  AC_MSG_CHECKING(whether or not to look for GTK+ 3)
+  AC_ARG_ENABLE(gtk3-check,
+	[  --enable-gtk3-check     If auto-select GUI, check for GTK+ 3 [default=yes]],
+	, enable_gtk3_check="yes")
+  AC_MSG_RESULT($enable_gtk3_check)
+  if test "x$enable_gtk3_check" = "xno"; then
+    SKIP_GTK3=YES
+  fi
+fi
+
+if test "x$SKIP_MOTIF" != "xYES" -a "$enable_gui_canon" != "motif"; then
+  AC_MSG_CHECKING(whether or not to look for Motif)
+  AC_ARG_ENABLE(motif-check,
+	[  --enable-motif-check    If auto-select GUI, check for Motif [default=yes]],
+	, enable_motif_check="yes")
+  AC_MSG_RESULT($enable_motif_check)
+  if test "x$enable_motif_check" = "xno"; then
+    SKIP_MOTIF=YES
+  fi
+fi
+
+dnl define an autoconf function to check for a specified version of GTK, and
+dnl try to compile/link a GTK program.
+dnl
+dnl AM_PATH_GTK([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
+dnl Test for GTK, and define GTK_CFLAGS, GTK_LIBDIR and GTK_LIBS
+dnl
+AC_DEFUN(AM_PATH_GTK,
+[
+  if test "X$GTK_CONFIG" != "Xno" -o "X$PKG_CONFIG" != "Xno"; then
+  {
+    no_gtk=""
+    if (test "X$SKIP_GTK2" != "XYES" -a "X$PKG_CONFIG" != "Xno") \
+	  && $PKG_CONFIG --exists gtk+-2.0; then
+    {
+      min_gtk_version=ifelse([$1], ,2.2.0,$1)
+      AC_MSG_CHECKING(for GTK - version >= $min_gtk_version)
+      dnl We should be using PKG_CHECK_MODULES() instead of this hack.
+      dnl But I guess the dependency on pkgconfig.m4 is not wanted or
+      dnl something like that.
+      GTK_CFLAGS=`$PKG_CONFIG --cflags gtk+-2.0`
+      GTK_LIBDIR=`$PKG_CONFIG --libs-only-L gtk+-2.0`
+      GTK_LIBS=`$PKG_CONFIG --libs gtk+-2.0`
+      gtk_major_version=`$PKG_CONFIG --modversion gtk+-2.0 | \
+	     sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\)/\1/'`
+      gtk_minor_version=`$PKG_CONFIG --modversion gtk+-2.0 | \
+	     sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\)/\2/'`
+      gtk_micro_version=`$PKG_CONFIG --modversion gtk+-2.0 | \
+	     sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\)/\3/'`
+    }
+    elif (test "X$SKIP_GTK3" != "XYES" -a "X$PKG_CONFIG" != "Xno") \
+	  && $PKG_CONFIG --exists gtk+-3.0; then
+    {
+      min_gtk_version=ifelse([$1], ,3.0.0,$1)
+      AC_MSG_CHECKING(for GTK - version >= $min_gtk_version)
+
+      GTK_CFLAGS=`$PKG_CONFIG --cflags gtk+-3.0`
+      GTK_LIBDIR=`$PKG_CONFIG --libs-only-L gtk+-3.0`
+      GTK_LIBS=`$PKG_CONFIG --libs gtk+-3.0`
+      gtk_major_version=`$PKG_CONFIG --modversion gtk+-3.0 | \
+	     sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\)/\1/'`
+      gtk_minor_version=`$PKG_CONFIG --modversion gtk+-3.0 | \
+	     sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\)/\2/'`
+      gtk_micro_version=`$PKG_CONFIG --modversion gtk+-3.0 | \
+	     sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\)/\3/'`
+    }
+    else
+      dnl Put some text before the "no" to hint at installing the gtk-dev
+      dnl packages.
+      AC_MSG_CHECKING(for GTK -dev package)
+      no_gtk=yes
+    fi
+
+    if test "x$enable_gtktest" = "xyes" -a "x$no_gtk" = "x"; then
+    {
+      ac_save_CFLAGS="$CFLAGS"
+      ac_save_LIBS="$LIBS"
+      CFLAGS="$CFLAGS $GTK_CFLAGS"
+      LIBS="$LIBS $GTK_LIBS"
+
+      dnl
+      dnl Now check if the installed GTK is sufficiently new.
+      dnl
+      rm -f conf.gtktest
+      AC_RUN_IFELSE([AC_LANG_SOURCE([
+#include <gtk/gtk.h>
+#include <stdio.h>
+#if STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#endif
+
+int
+main ()
+{
+int major, minor, micro;
+char *tmp_version;
+
+system ("touch conf.gtktest");
+
+/* HP/UX 9 (%@#!) writes to sscanf strings */
+tmp_version = g_strdup("$min_gtk_version");
+if (sscanf(tmp_version, "%d.%d.%d", &major, &minor, &micro) != 3) {
+   printf("%s, bad version string\n", "$min_gtk_version");
+   g_free(tmp_version);
+   exit(1);
+ }
+
+g_free(tmp_version);
+
+if ((gtk_major_version > major) ||
+    ((gtk_major_version == major) && (gtk_minor_version > minor)) ||
+    ((gtk_major_version == major) && (gtk_minor_version == minor) &&
+				     (gtk_micro_version >= micro)))
+{
+    return 0;
+}
+return 1;
+}
+])],, no_gtk=yes,[echo $ac_n "cross compiling; assumed OK... $ac_c"])
+      CFLAGS="$ac_save_CFLAGS"
+      LIBS="$ac_save_LIBS"
+    }
+    fi
+    if test "x$no_gtk" = x ; then
+      if test "x$enable_gtktest" = "xyes"; then
+	AC_MSG_RESULT(yes; found version $gtk_major_version.$gtk_minor_version.$gtk_micro_version)
+      else
+	AC_MSG_RESULT(found version $gtk_major_version.$gtk_minor_version.$gtk_micro_version)
+      fi
+      ifelse([$2], , :, [$2])
+    else
+    {
+      AC_MSG_RESULT(no)
+      GTK_CFLAGS=""
+      GTK_LIBS=""
+      ifelse([$3], , :, [$3])
+      if test "$fail_if_missing" = "yes" -a "X$gui_auto" != "Xyes"; then
+	AC_MSG_ERROR([could not configure GTK])
+      fi
+    }
+    fi
+  }
+  else
+    GTK_CFLAGS=""
+    GTK_LIBS=""
+    ifelse([$3], , :, [$3])
+  fi
+  AC_SUBST(GTK_CFLAGS)
+  AC_SUBST(GTK_LIBS)
+  rm -f conf.gtktest
+])
+
+dnl ---------------------------------------------------------------------------
+dnl gnome
+dnl ---------------------------------------------------------------------------
+AC_DEFUN([GNOME_INIT_HOOK],
+[
+  AC_SUBST(GNOME_LIBS)
+  AC_SUBST(GNOME_LIBDIR)
+  AC_SUBST(GNOME_INCLUDEDIR)
+
+  AC_ARG_WITH(gnome-includes,
+    [  --with-gnome-includes=DIR Specify location of GNOME headers],
+    [CFLAGS="$CFLAGS -I$withval"]
+  )
+
+  AC_ARG_WITH(gnome-libs,
+    [  --with-gnome-libs=DIR   Specify location of GNOME libs],
+    [LDFLAGS="$LDFLAGS -L$withval" gnome_prefix=$withval]
+  )
+
+  AC_ARG_WITH(gnome,
+    [  --with-gnome            Specify prefix for GNOME files],
+    if test x$withval = xyes; then
+      want_gnome=yes
+      ifelse([$1], [], :, [$1])
+    else
+      if test "x$withval" = xno; then
+	want_gnome=no
+      else
+	want_gnome=yes
+	LDFLAGS="$LDFLAGS -L$withval/lib"
+	CFLAGS="$CFLAGS -I$withval/include"
+	gnome_prefix=$withval/lib
+      fi
+    fi,
+    want_gnome=yes)
+
+  if test "x$want_gnome" = xyes; then
+  {
+    AC_MSG_CHECKING(for libgnomeui-2.0)
+    if $PKG_CONFIG --exists libgnomeui-2.0; then
+      AC_MSG_RESULT(yes)
+      GNOME_LIBS=`$PKG_CONFIG --libs-only-l libgnomeui-2.0`
+      GNOME_LIBDIR=`$PKG_CONFIG --libs-only-L libgnomeui-2.0`
+      GNOME_INCLUDEDIR=`$PKG_CONFIG --cflags libgnomeui-2.0`
+
+      dnl On FreeBSD we need -pthread but pkg-config doesn't include it.
+      dnl This might not be the right way but it works for me...
+      AC_MSG_CHECKING(for FreeBSD)
+      if test "$vim_cv_uname_output" = FreeBSD; then
+	AC_MSG_RESULT(yes, adding -pthread)
+	GNOME_INCLUDEDIR="$GNOME_INCLUDEDIR -D_THREAD_SAFE"
+	GNOME_LIBS="$GNOME_LIBS -pthread"
+      else
+	AC_MSG_RESULT(no)
+      fi
+      $1
+    else
+      AC_MSG_RESULT(not found)
+      if test "x$2" = xfail; then
+	AC_MSG_ERROR(Could not find libgnomeui-2.0 via pkg-config)
+      fi
+    fi
+  }
+  fi
+])
+
+AC_DEFUN([GNOME_INIT],[
+	GNOME_INIT_HOOK([],fail)
+])
+
+if test "X$PKG_CONFIG" = "X"; then
+  AC_PATH_TOOL(PKG_CONFIG, pkg-config, no)
+fi
+
+
+dnl ---------------------------------------------------------------------------
+dnl Check for GTK2.  If it fails, then continue on for Motif as before...
+dnl ---------------------------------------------------------------------------
+if test -z "$SKIP_GTK2"; then
+
+  AC_MSG_CHECKING(--disable-gtktest argument)
+  AC_ARG_ENABLE(gtktest, [  --disable-gtktest       Do not try to compile and run a test GTK program],
+	, enable_gtktest=yes)
+  if test "x$enable_gtktest" = "xyes" ; then
+    AC_MSG_RESULT(gtk test enabled)
+  else
+    AC_MSG_RESULT(gtk test disabled)
+  fi
+
+  if test "x$PKG_CONFIG" != "xno"; then
+    dnl First try finding version 2.2.0 or later.  The 2.0.x series has
+    dnl problems (bold fonts, --remote doesn't work).
+    dnl Disable checking for GTK3 here, otherwise it's found when GTK2 is not
+    dnl found.
+    save_skip_gtk3=$SKIP_GTK3
+    SKIP_GTK3=YES
+    AM_PATH_GTK(2.2.0,
+		[GUI_LIB_LOC="$GTK_LIBDIR"
+		 GTK_LIBNAME="$GTK_LIBS"
+		GUI_INC_LOC="$GTK_CFLAGS"], )
+    if test "x$GTK_CFLAGS" != "x"; then
+      SKIP_GTK3=YES
+      SKIP_MOTIF=YES
+      GUITYPE=GTK
+      AC_SUBST(GTK_LIBNAME)
+    else
+      SKIP_GTK3=$save_skip_gtk3
+    fi
+  fi
+  if test "x$GUITYPE" = "xGTK"; then
+    dnl
+    dnl if GTK exists, then check for GNOME.
+    dnl
+    if test -z "$SKIP_GNOME"; then
+    {
+      GNOME_INIT_HOOK([have_gnome=yes])
+      if test "x$have_gnome" = xyes ; then
+	AC_DEFINE(FEAT_GUI_GNOME)
+	GUI_INC_LOC="$GUI_INC_LOC $GNOME_INCLUDEDIR"
+	GTK_LIBNAME="$GTK_LIBNAME $GNOME_LIBDIR $GNOME_LIBS"
+      fi
+    }
+    fi
+  fi
+fi
+
+
+dnl ---------------------------------------------------------------------------
+dnl Check for GTK3.
+dnl ---------------------------------------------------------------------------
+if test -z "$SKIP_GTK3"; then
+
+  AC_MSG_CHECKING(--disable-gtktest argument)
+  AC_ARG_ENABLE(gtktest, [  --disable-gtktest       Do not try to compile and run a test GTK program],
+	, enable_gtktest=yes)
+  if test "x$enable_gtktest" = "xyes" ; then
+    AC_MSG_RESULT(gtk test enabled)
+  else
+    AC_MSG_RESULT(gtk test disabled)
+  fi
+
+  if test "x$PKG_CONFIG" != "xno"; then
+    save_skip_gtk2=$SKIP_GTK2
+    SKIP_GTK2=YES
+    AM_PATH_GTK(3.0.0,
+		[GUI_LIB_LOC="$GTK_LIBDIR"
+		 GTK_LIBNAME="$GTK_LIBS"
+		GUI_INC_LOC="$GTK_CFLAGS"], )
+    if test "x$GTK_CFLAGS" != "x"; then
+      SKIP_GTK2=YES
+      SKIP_GNOME=YES
+      SKIP_MOTIF=YES
+      GUITYPE=GTK
+      AC_SUBST(GTK_LIBNAME)
+      AC_DEFINE(USE_GTK3)
+    else
+      SKIP_GTK2=$save_skip_gtk2
+    fi
+  fi
+fi
+
+dnl Check the version of Gdk-Pixbuf.  If the version is 2.31 or later and
+dnl glib-compile-resources is found in PATH, use GResource.
+if test "x$GUITYPE" = "xGTK"; then
+  AC_MSG_CHECKING([version of Gdk-Pixbuf])
+  gdk_pixbuf_version=`$PKG_CONFIG --modversion gdk-pixbuf-2.0`
+  if test "x$gdk_pixbuf_version" != x ; then
+    gdk_pixbuf_version_minor=`echo $gdk_pixbuf_version | \
+      sed -e 's/[[0-9]][[0-9]]*\.\([[0-9]][[0-9]]*\)\.[[0-9]][[0-9]]*/\1/'`
+    if test "x$gdk_pixbuf_version_minor" != x -a \
+	$gdk_pixbuf_version_minor -ge 31 ; then
+      AC_MSG_RESULT([OK.])
+      AC_PATH_PROG(GLIB_COMPILE_RESOURCES,[glib-compile-resources],no)
+      AC_MSG_CHECKING([glib-compile-resources])
+      if test "x$GLIB_COMPILE_RESOURCES" = xno ; then
+	GLIB_COMPILE_RESOURCES=""
+	AC_MSG_RESULT([cannot be found in PATH.])
+      else
+	AC_MSG_RESULT([usable.])
+	AC_DEFINE(USE_GRESOURCE)
+	GRESOURCE_SRC="auto/gui_gtk_gresources.c"
+	GRESOURCE_OBJ="objects/gui_gtk_gresources.o"
+      fi
+    else
+      AC_MSG_RESULT([not usable.])
+    fi
+  else
+    AC_MSG_RESULT([cannot obtain from pkg_config.])
+  fi
+
+  AC_MSG_CHECKING([--disable-icon-cache-update argument])
+  AC_ARG_ENABLE(icon_cache_update,
+          [  --disable-icon-cache-update        update disabled],
+          [],
+          [enable_icon_cache_update="yes"])
+  if test "$enable_icon_cache_update" = "yes"; then
+    AC_MSG_RESULT([not set])
+    AC_PATH_PROG(GTK_UPDATE_ICON_CACHE,[gtk-update-icon-cache],no)
+    if test "x$GTK_UPDATE_ICON_CACHE" = "xno" ; then
+      AC_MSG_RESULT([not found in PATH.])
+    fi
+  else
+    AC_MSG_RESULT([update disabled])
+  fi
+
+  AC_MSG_CHECKING([--disable-desktop-database-update argument])
+  AC_ARG_ENABLE(desktop_database_update,
+          [  --disable-desktop-database-update  update disabled],
+          [],
+          [enable_desktop_database_update="yes"])
+  if test "$enable_desktop_database_update" = "yes"; then
+    AC_MSG_RESULT([not set])
+    AC_PATH_PROG(UPDATE_DESKTOP_DATABASE,[update-desktop-database],no)
+    if test "x$UPDATE_DESKTOP_DATABASE" = "xno" ; then
+      AC_MSG_RESULT([not found in PATH.])
+    fi
+  else
+    AC_MSG_RESULT([update disabled])
+  fi
+fi
+AC_SUBST(GLIB_COMPILE_RESOURCES)
+AC_SUBST(GRESOURCE_SRC)
+AC_SUBST(GRESOURCE_OBJ)
+AC_SUBST(GTK_UPDATE_ICON_CACHE)
+AC_SUBST(UPDATE_DESKTOP_DATABASE)
+
+dnl Check for Motif include files location.
+dnl The LAST one found is used, this makes the highest version to be used,
+dnl e.g. when Motif1.2 and Motif2.0 are both present.
+
+if test -z "$SKIP_MOTIF"; then
+  gui_XXX="/usr/XXX/Motif* /usr/Motif*/XXX /usr/XXX /usr/shlib /usr/X11*/XXX /usr/XXX/X11* /usr/dt/XXX /local/Motif*/XXX /local/XXX/Motif* /usr/local/Motif*/XXX /usr/local/XXX/Motif* /usr/local/XXX /usr/local/X11*/XXX /usr/local/LessTif/Motif*/XXX $MOTIFHOME/XXX"
+  dnl Remove "-I" from before $GUI_INC_LOC if it's there
+  GUI_INC_LOC="`echo $GUI_INC_LOC|sed 's%-I%%g'`"
+
+  AC_MSG_CHECKING(for location of Motif GUI includes)
+  gui_includes="`echo $x_includes|sed 's%/[^/][^/]*$%%'` `echo "$gui_XXX" | sed s/XXX/include/g` $GUI_INC_LOC"
+  GUI_INC_LOC=
+  for try in $gui_includes; do
+    if test -f "$try/Xm/Xm.h"; then
+      GUI_INC_LOC=$try
+    fi
+  done
+  if test -n "$GUI_INC_LOC"; then
+    if test "$GUI_INC_LOC" = /usr/include; then
+      GUI_INC_LOC=
+      AC_MSG_RESULT(in default path)
+    else
+      AC_MSG_RESULT($GUI_INC_LOC)
+    fi
+  else
+    AC_MSG_RESULT(<not found>)
+    SKIP_MOTIF=YES
+  fi
+fi
+
+dnl Check for Motif library files location.  In the same order as the include
+dnl files, to avoid a mixup if several versions are present
+
+if test -z "$SKIP_MOTIF"; then
+  AC_MSG_CHECKING(--with-motif-lib argument)
+  AC_ARG_WITH(motif-lib,
+  [  --with-motif-lib=STRING Library for Motif ],
+  [ MOTIF_LIBNAME="${withval}" ] )
+
+  if test -n "$MOTIF_LIBNAME"; then
+    AC_MSG_RESULT($MOTIF_LIBNAME)
+    GUI_LIB_LOC=
+  else
+    AC_MSG_RESULT(no)
+
+    dnl Remove "-L" from before $GUI_LIB_LOC if it's there
+    GUI_LIB_LOC="`echo $GUI_LIB_LOC|sed 's%-L%%g'`"
+
+    dnl Ubuntu has libXm.so in /usr/lib/i386-linux-gnu and elsewhere.  The
+    dnl linker will figure out which one to use, we only check if one exists.
+    dnl Cygwin uses the .dll.a extension.
+    dnl OpenSUSE appears to use /usr/lib64.
+    AC_MSG_CHECKING(for location of Motif GUI libs)
+    gui_libs="`echo $x_libraries|sed 's%/[^/][^/]*$%%'` `echo "$gui_XXX" | sed s/XXX/lib/g` /usr/lib64 /usr/lib/i386-linux-gnu /usr/lib/x86_64-linux-gnu `echo "$GUI_INC_LOC" | sed s/include/lib/` $GUI_LIB_LOC"
+    GUI_LIB_LOC=
+    for try in $gui_libs; do
+      for libtry in "$try"/libXm.a "$try"/libXm.dll.a "$try"/libXm.so* "$try"/libXm.sl "$try"/libXm.dylib; do
+	if test -f "$libtry"; then
+	  GUI_LIB_LOC=$try
+	fi
+      done
+    done
+    if test -n "$GUI_LIB_LOC"; then
+      dnl Remove /usr/lib, it causes trouble on some systems.
+      dnl For consistency also remove other standard lib directories.
+      if test "$GUI_LIB_LOC" = /usr/lib \
+	   -o "$GUI_LIB_LOC" = /usr/lib64 \
+	   -o "$GUI_LIB_LOC" = /usr/lib/i386-linux-gnu \
+	   -o "$GUI_LIB_LOC" = /usr/lib/x86_64-linux-gnu; then
+	GUI_LIB_LOC=
+	AC_MSG_RESULT(in default path)
+      else
+	if test -n "$GUI_LIB_LOC"; then
+	  AC_MSG_RESULT($GUI_LIB_LOC)
+	  if test "$vim_cv_uname_output" = SunOS &&
+					 echo $vim_cv_uname_r_output | grep '^5' >/dev/null; then
+	    GUI_LIB_LOC="$GUI_LIB_LOC -R $GUI_LIB_LOC"
+	  fi
+	fi
+      fi
+      MOTIF_LIBNAME=-lXm
+    else
+      AC_MSG_RESULT(<not found>)
+      SKIP_MOTIF=YES
+    fi
+  fi
+fi
+
+if test -z "$SKIP_MOTIF"; then
+  GUITYPE=MOTIF
+  AC_SUBST(MOTIF_LIBNAME)
+fi
+
+if test -z "$SKIP_MOTIF"; then
+  dnl Prepend -I and -L to $GUI_INC_LOC and $GUI_LIB_LOC if not empty
+  dnl Avoid adding it when it twice
+  if test -n "$GUI_INC_LOC"; then
+    GUI_INC_LOC=-I"`echo $GUI_INC_LOC|sed 's%-I%%'`"
+  fi
+  if test -n "$GUI_LIB_LOC"; then
+    GUI_LIB_LOC=-L"`echo $GUI_LIB_LOC|sed 's%-L%%'`"
+  fi
+
+  dnl Check for -lXext and then for -lXmu
+  ldflags_save=$LDFLAGS
+  LDFLAGS="$X_LIBS $LDFLAGS"
+  AC_CHECK_LIB(Xext, XShapeQueryExtension, [GUI_X_LIBS="-lXext"],,
+		[-lXt $X_PRE_LIBS -lX11 $X_EXTRA_LIBS])
+  dnl For Solaris we need -lw and -ldl before linking with -lXmu works.
+  AC_CHECK_LIB(w, wslen, [X_EXTRA_LIBS="$X_EXTRA_LIBS -lw"],,
+		[$GUI_X_LIBS -lXt $X_PRE_LIBS -lX11 $X_EXTRA_LIBS])
+  AC_CHECK_LIB(dl, dlsym, [X_EXTRA_LIBS="$X_EXTRA_LIBS -ldl"],,
+		[$GUI_X_LIBS -lXt $X_PRE_LIBS -lX11 $X_EXTRA_LIBS])
+  AC_CHECK_LIB(Xmu, XmuCreateStippledPixmap, [GUI_X_LIBS="-lXmu $GUI_X_LIBS"],,
+		[$GUI_X_LIBS -lXt $X_PRE_LIBS -lX11 $X_EXTRA_LIBS])
+  if test -z "$SKIP_MOTIF"; then
+    AC_CHECK_LIB(Xp, XpEndJob, [GUI_X_LIBS="-lXp $GUI_X_LIBS"],,
+		[$GUI_X_LIBS -lXm -lXt $X_PRE_LIBS -lX11 $X_EXTRA_LIBS])
+  fi
+  LDFLAGS=$ldflags_save
+
+  dnl Execute xmkmf to figure out if -DNARROWPROTO is needed.
+  AC_MSG_CHECKING(for extra X11 defines)
+  NARROW_PROTO=
+  rm -fr conftestdir
+  if mkdir conftestdir; then
+    cd conftestdir
+    cat > Imakefile <<'EOF'
+acfindx:
+	@echo 'NARROW_PROTO="${PROTO_DEFINES}"'
+EOF
+    if (xmkmf) >/dev/null 2>/dev/null && test -f Makefile; then
+      eval `${MAKE-make} acfindx 2>/dev/null | grep -v make`
+    fi
+    cd ..
+    rm -fr conftestdir
+  fi
+  if test -z "$NARROW_PROTO"; then
+    AC_MSG_RESULT(no)
+  else
+    AC_MSG_RESULT($NARROW_PROTO)
+  fi
+  AC_SUBST(NARROW_PROTO)
+fi
+
+dnl Look for XSMP support - but don't necessarily restrict it to X11 GUIs
+dnl use the X11 include path
+if test "$enable_xsmp" = "yes"; then
+  cppflags_save=$CPPFLAGS
+  CPPFLAGS="$CPPFLAGS $X_CFLAGS"
+  AC_CHECK_HEADERS(X11/SM/SMlib.h)
+  CPPFLAGS=$cppflags_save
+fi
+
+
+if test -z "$SKIP_MOTIF" -o -z "$SKIP_GTK2" -o -z "$SKIP_GTK3"; then
+  dnl Check for X11/xpm.h and X11/Sunkeysym.h with the GUI include path
+  cppflags_save=$CPPFLAGS
+  CPPFLAGS="$CPPFLAGS $X_CFLAGS"
+  AC_CHECK_HEADERS(X11/xpm.h X11/Sunkeysym.h)
+
+  dnl automatically disable XIM when XIMtext isn't in X11/Xlib.h
+  if test ! "$enable_xim" = "no"; then
+    AC_MSG_CHECKING(for XIMText in X11/Xlib.h)
+    AC_EGREP_CPP(XIMText, [#include <X11/Xlib.h>],
+		  AC_MSG_RESULT(yes),
+		  AC_MSG_RESULT(no; xim has been disabled); enable_xim="no")
+  fi
+  CPPFLAGS=$cppflags_save
+
+  dnl automatically enable XIM in the GUI
+  if test "$enable_xim" = "auto" -a "x$GUITYPE" != "xNONE" ; then
+    AC_MSG_RESULT(X GUI selected; xim has been enabled)
+    enable_xim="yes"
+  fi
+fi
+
+if test -z "$SKIP_MOTIF"; then
+  cppflags_save=$CPPFLAGS
+  CPPFLAGS="$CPPFLAGS $X_CFLAGS"
+dnl Xmu/Editres.h may exist but can only be used after including Intrinsic.h
+  AC_MSG_CHECKING([for X11/Xmu/Editres.h])
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
+#include <X11/Intrinsic.h>
+#include <X11/Xmu/Editres.h>],
+		      [int i; i = 0;])],
+	      AC_MSG_RESULT(yes)
+		      AC_DEFINE(HAVE_X11_XMU_EDITRES_H),
+	      AC_MSG_RESULT(no))
+  CPPFLAGS=$cppflags_save
+fi
+
+dnl Only use the Xm directory when compiling Motif.
+if test -z "$SKIP_MOTIF"; then
+  cppflags_save=$CPPFLAGS
+  CPPFLAGS="$CPPFLAGS $X_CFLAGS"
+  if test "$zOSUnix" = "yes"; then
+	AC_CHECK_HEADERS(Xm/Xm.h)
+  else
+	AC_CHECK_HEADERS(Xm/Xm.h Xm/XpmP.h Xm/JoinSideT.h Xm/TraitP.h Xm/Manager.h Xm/UnhighlightT.h Xm/Notebook.h)
+  fi
+
+  if test "x$ac_cv_header_Xm_XpmP_h" = "xyes"; then
+    dnl Solaris uses XpmAttributes_21, very annoying.
+    AC_MSG_CHECKING([for XpmAttributes_21 in Xm/XpmP.h])
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <Xm/XpmP.h>], [XpmAttributes_21 attr;])],
+	AC_MSG_RESULT(yes); AC_DEFINE(XPMATTRIBUTES_TYPE, XpmAttributes_21),
+	AC_MSG_RESULT(no); AC_DEFINE(XPMATTRIBUTES_TYPE, XpmAttributes)
+	)
+  else
+    AC_DEFINE(XPMATTRIBUTES_TYPE, XpmAttributes)
+  fi
+  CPPFLAGS=$cppflags_save
+fi
+
+if test "x$GUITYPE" = "xNONE" -a "$enable_xim" = "yes"; then
+  AC_MSG_RESULT(no GUI selected; xim has been disabled)
+  enable_xim="no"
+fi
+if test "x$GUITYPE" = "xNONE" -a "$enable_fontset" = "yes"; then
+  AC_MSG_RESULT(no GUI selected; fontset has been disabled)
+  enable_fontset="no"
+fi
+if test "x$GUITYPE:$enable_fontset" = "xGTK:yes"; then
+  AC_MSG_RESULT(GTK+ 2 GUI selected; fontset has been disabled)
+  enable_fontset="no"
+fi
+
+dnl There is no test for the Haiku GUI, if it's selected it's used
+if test -z "$SKIP_HAIKU"; then
+  GUITYPE=HAIKUGUI
+fi
+
+if test -z "$SKIP_PHOTON"; then
+  GUITYPE=PHOTONGUI
+fi
+
+AC_SUBST(GUI_INC_LOC)
+AC_SUBST(GUI_LIB_LOC)
+AC_SUBST(GUITYPE)
+AC_SUBST(GUI_X_LIBS)
+
+if test "$enable_workshop" = "yes" -a -n "$SKIP_MOTIF"; then
+  AC_MSG_ERROR([cannot use workshop without Motif])
+fi
+
+dnl defining FEAT_XIM and FEAT_XFONTSET is delayed, so that they can be disabled
+if test "$enable_xim" = "yes"; then
+  AC_DEFINE(FEAT_XIM)
+fi
+if test "$enable_fontset" = "yes"; then
+  AC_DEFINE(FEAT_XFONTSET)
+fi
+
+
+dnl ---------------------------------------------------------------------------
+dnl end of GUI-checking
+dnl ---------------------------------------------------------------------------
+
+AC_MSG_CHECKING([for /proc link to executable])
+if test -L "/proc/self/exe"; then
+  dnl Linux
+  AC_MSG_RESULT([/proc/self/exe])
+  AC_DEFINE(PROC_EXE_LINK, "/proc/self/exe")
+elif test -L "/proc/self/path/a.out"; then
+  dnl Solaris
+  AC_MSG_RESULT([/proc/self/path/a.out])
+  AC_DEFINE(PROC_EXE_LINK, "/proc/self/path/a.out")
+elif test -L "/proc/curproc/file"; then
+  dnl FreeBSD
+  AC_MSG_RESULT([/proc/curproc/file])
+  AC_DEFINE(PROC_EXE_LINK, "/proc/curproc/file")
+else
+  AC_MSG_RESULT(no)
+fi
+
+dnl Check for Cygwin, which needs an extra source file if not using X11
+AC_MSG_CHECKING(for CYGWIN or MSYS environment)
+case $vim_cv_uname_output in
+    CYGWIN*|MSYS*)    CYGWIN=yes; AC_MSG_RESULT(yes)
+                AC_MSG_CHECKING(for CYGWIN clipboard support)
+                if test "x$with_x" = "xno" ; then
+                  OS_EXTRA_SRC=winclip.c; OS_EXTRA_OBJ=objects/winclip.o
+                  AC_MSG_RESULT(yes)
+                  AC_DEFINE(FEAT_CYGWIN_WIN32_CLIPBOARD)
+                else
+                  AC_MSG_RESULT(no - using X11)
+                fi ;;
+
+    *)          CYGWIN=no; AC_MSG_RESULT(no);;
+esac
+
+dnl Checks for libraries and include files.
+
+AC_CACHE_CHECK([whether toupper is broken], [vim_cv_toupper_broken],
+  [
+    AC_RUN_IFELSE([AC_LANG_SOURCE([[
+#include "confdefs.h"
+#include <ctype.h>
+#if STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#endif
+int main() { exit(toupper('A') == 'A' && tolower('z') == 'z'); }
+  ]])],[
+    vim_cv_toupper_broken=yes
+  ],[
+    vim_cv_toupper_broken=no
+  ],[
+    AC_MSG_ERROR(cross-compiling: please set 'vim_cv_toupper_broken')
+  ])])
+
+if test "x$vim_cv_toupper_broken" = "xyes" ; then
+  AC_DEFINE(BROKEN_TOUPPER)
+fi
+
+AC_MSG_CHECKING(whether __DATE__ and __TIME__ work)
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <stdio.h>], [printf("(" __DATE__ " " __TIME__ ")");])],
+	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_DATE_TIME),
+	AC_MSG_RESULT(no))
+
+AC_MSG_CHECKING(whether __attribute__((unused)) is allowed)
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <stdio.h>], [int x __attribute__((unused));])],
+	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_ATTRIBUTE_UNUSED),
+	AC_MSG_RESULT(no))
+
+dnl Checks for header files.
+AC_CHECK_HEADER(elf.h, HAS_ELF=1)
+dnl AC_CHECK_HEADER(dwarf.h, SVR4=1)
+if test "$HAS_ELF" = 1; then
+  AC_CHECK_LIB(elf, main)
+fi
+
+AC_HEADER_DIRENT
+
+dnl If sys/wait.h is not found it might still exist but not be POSIX
+dnl compliant. In that case we define HAVE_UNION_WAIT (for NeXT)
+if test $ac_cv_header_sys_wait_h = no; then
+  AC_MSG_CHECKING([for sys/wait.h that defines union wait])
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <sys/wait.h>],
+			[union wait xx, yy; xx = yy])],
+		AC_MSG_RESULT(yes)
+			AC_DEFINE(HAVE_SYS_WAIT_H)
+			AC_DEFINE(HAVE_UNION_WAIT),
+		AC_MSG_RESULT(no))
+fi
+
+AC_CHECK_HEADERS(stdint.h stdlib.h string.h \
+	sys/select.h sys/utsname.h termcap.h fcntl.h \
+	sgtty.h sys/ioctl.h sys/time.h sys/types.h \
+	termio.h iconv.h inttypes.h langinfo.h math.h \
+	unistd.h stropts.h errno.h sys/resource.h \
+	sys/systeminfo.h locale.h sys/stream.h termios.h \
+	libc.h sys/statfs.h poll.h sys/poll.h pwd.h \
+	utime.h sys/param.h sys/ptms.h libintl.h libgen.h \
+	util/debug.h util/msg18n.h frame.h sys/acl.h \
+	sys/access.h sys/sysinfo.h wchar.h wctype.h)
+
+dnl sys/ptem.h depends on sys/stream.h on Solaris
+AC_CHECK_HEADERS(sys/ptem.h, [], [],
+[#if defined HAVE_SYS_STREAM_H
+#  include <sys/stream.h>
+#endif])
+
+dnl sys/sysctl.h depends on sys/param.h on OpenBSD
+AC_CHECK_HEADERS(sys/sysctl.h, [], [],
+[#if defined HAVE_SYS_PARAM_H
+#  include <sys/param.h>
+#endif])
+
+
+dnl pthread_np.h may exist but can only be used after including pthread.h
+AC_MSG_CHECKING([for pthread_np.h])
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
+#include <pthread.h>
+#include <pthread_np.h>],
+		      [int i; i = 0;])],
+	      AC_MSG_RESULT(yes)
+		      AC_DEFINE(HAVE_PTHREAD_NP_H),
+	      AC_MSG_RESULT(no))
+
+AC_CHECK_HEADERS(strings.h)
+if test "x$MACOS_X" = "xyes"; then
+  dnl The strings.h file on OS/X contains a warning and nothing useful.
+  AC_DEFINE(NO_STRINGS_WITH_STRING_H)
+else
+
+dnl Check if strings.h and string.h can both be included when defined.
+AC_MSG_CHECKING([if strings.h can be included after string.h])
+cppflags_save=$CPPFLAGS
+CPPFLAGS="$CPPFLAGS $X_CFLAGS"
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
+#if defined(_AIX) && !defined(_AIX51) && !defined(_NO_PROTO)
+# define _NO_PROTO	/* like in os_unix.h, causes conflict for AIX (Winn) */
+			/* but don't do it on AIX 5.1 (Uribarri) */
+#endif
+#ifdef HAVE_XM_XM_H
+# include <Xm/Xm.h>	/* This breaks it for HP-UX 11 (Squassabia) */
+#endif
+#ifdef HAVE_STRING_H
+# include <string.h>
+#endif
+#if defined(HAVE_STRINGS_H)
+# include <strings.h>
+#endif
+		], [int i; i = 0;])],
+		AC_MSG_RESULT(yes),
+		AC_DEFINE(NO_STRINGS_WITH_STRING_H)
+		AC_MSG_RESULT(no))
+CPPFLAGS=$cppflags_save
+fi
+
+dnl Checks for typedefs, structures, and compiler characteristics.
+AC_PROG_GCC_TRADITIONAL
+AC_C_CONST
+AC_C_VOLATILE
+AC_TYPE_MODE_T
+AC_TYPE_OFF_T
+AC_TYPE_PID_T
+AC_TYPE_SIZE_T
+AC_TYPE_UID_T
+AC_TYPE_UINT32_T
+
+AC_CHECK_HEADERS_ONCE([sys/time.h])
+
+AC_CHECK_TYPE(ino_t, long)
+AC_CHECK_TYPE(dev_t, unsigned)
+AC_C_BIGENDIAN(,,,)
+AC_C_INLINE
+
+AC_MSG_CHECKING(for rlim_t)
+if eval "test \"`echo '$''{'ac_cv_type_rlim_t'+set}'`\" = set"; then
+  AC_MSG_RESULT([(cached) $ac_cv_type_rlim_t])
+else
+  AC_EGREP_CPP(dnl
+changequote(<<,>>)dnl
+<<(^|[^a-zA-Z_0-9])rlim_t[^a-zA-Z_0-9]>>dnl
+changequote([,]),
+  [
+#include <sys/types.h>
+#if STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#endif
+#ifdef HAVE_SYS_RESOURCE_H
+# include <sys/resource.h>
+#endif
+	  ], ac_cv_type_rlim_t=yes, ac_cv_type_rlim_t=no)
+	  AC_MSG_RESULT($ac_cv_type_rlim_t)
+fi
+if test $ac_cv_type_rlim_t = no; then
+  cat >> confdefs.h <<\EOF
+#define rlim_t unsigned long
+EOF
+fi
+
+AC_MSG_CHECKING(for stack_t)
+if eval "test \"`echo '$''{'ac_cv_type_stack_t'+set}'`\" = set"; then
+  AC_MSG_RESULT([(cached) $ac_cv_type_stack_t])
+else
+  AC_EGREP_CPP(stack_t,
+  [
+#include <sys/types.h>
+#if STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#endif
+#include <signal.h>
+	  ], ac_cv_type_stack_t=yes, ac_cv_type_stack_t=no)
+	  AC_MSG_RESULT($ac_cv_type_stack_t)
+fi
+if test $ac_cv_type_stack_t = no; then
+  cat >> confdefs.h <<\EOF
+#define stack_t struct sigaltstack
+EOF
+fi
+
+dnl BSDI uses ss_base while others use ss_sp for the stack pointer.
+AC_MSG_CHECKING(whether stack_t has an ss_base field)
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
+#include <sys/types.h>
+#if STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#endif
+#include <signal.h>
+#include "confdefs.h"
+			], [stack_t sigstk; sigstk.ss_base = 0; ])],
+	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_SS_BASE),
+	AC_MSG_RESULT(no))
+
+olibs="$LIBS"
+AC_MSG_CHECKING(--with-tlib argument)
+AC_ARG_WITH(tlib, [  --with-tlib=library     terminal library to be used ],)
+if test -n "$with_tlib"; then
+  AC_MSG_RESULT($with_tlib)
+  LIBS="$LIBS -l$with_tlib"
+  AC_MSG_CHECKING(for linking with $with_tlib library)
+  AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], AC_MSG_RESULT(OK), AC_MSG_ERROR(FAILED))
+  dnl Need to check for tgetent() below.
+  olibs="$LIBS"
+else
+  AC_MSG_RESULT([empty: automatic terminal library selection])
+  dnl  On HP-UX 10.10 termcap or termlib should be used instead of
+  dnl  curses, because curses is much slower.
+  dnl  Newer versions of ncurses are preferred over anything, except
+  dnl  when tinfo has been split off, it contains all we need.
+  dnl  Older versions of ncurses have bugs, get a new one!
+  dnl  Digital Unix (OSF1) should use curses (Ronald Schild).
+  dnl  On SCO Openserver should prefer termlib (Roger Cornelius).
+  case "$vim_cv_uname_output" in
+	OSF1|SCO_SV)	tlibs="tinfo ncurses curses termlib termcap";;
+	*)	tlibs="tinfo ncurses termlib termcap curses";;
+  esac
+  for libname in $tlibs; do
+    AC_CHECK_LIB(${libname}, tgetent,,)
+    if test "x$olibs" != "x$LIBS"; then
+      dnl It's possible that a library is found but it doesn't work
+      dnl e.g., shared library that cannot be found
+      dnl compile and run a test program to be sure
+      AC_RUN_IFELSE([AC_LANG_SOURCE([
+#ifdef HAVE_TERMCAP_H
+# include <termcap.h>
+#endif
+#if STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#endif
+int main() {char *s; s=(char *)tgoto("%p1%d", 0, 1); exit(0); }])],
+			  res="OK", res="FAIL", res="FAIL")
+      if test "$res" = "OK"; then
+	break
+      fi
+      AC_MSG_RESULT($libname library is not usable)
+      LIBS="$olibs"
+    fi
+  done
+  if test "x$olibs" = "x$LIBS"; then
+    AC_MSG_RESULT(no terminal library found)
+  fi
+fi
+
+if test "x$olibs" = "x$LIBS"; then
+  AC_MSG_CHECKING([for tgetent()])
+  AC_LINK_IFELSE([AC_LANG_PROGRAM([int tgetent(char *, const char *);],
+      [[char s[10000]; int res = tgetent(s, "thisterminaldoesnotexist");]])],
+	AC_MSG_RESULT(yes),
+	AC_MSG_ERROR([NOT FOUND!
+      You need to install a terminal library; for example ncurses.
+      On Linux that would be the libncurses-dev package.
+      Or specify the name of the library with --with-tlib.]))
+fi
+
+AC_CACHE_CHECK([whether we talk terminfo], [vim_cv_terminfo],
+  [
+    AC_RUN_IFELSE([AC_LANG_SOURCE([[
+#include "confdefs.h"
+#ifdef HAVE_TERMCAP_H
+# include <termcap.h>
+#endif
+#ifdef HAVE_STRING_H
+# include <string.h>
+#endif
+#if STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#endif
+int main()
+{char *s; s=(char *)tgoto("%p1%d", 0, 1); exit(!strcmp(s==0 ? "" : s, "1")); }
+    ]])],[
+      vim_cv_terminfo=no
+    ],[
+      vim_cv_terminfo=yes
+    ],[
+      AC_MSG_ERROR(cross-compiling: please set 'vim_cv_terminfo')
+    ])
+  ])
+
+if test "x$vim_cv_terminfo" = "xyes" ; then
+  AC_DEFINE(TERMINFO)
+fi
+
+AC_CACHE_CHECK([what tgetent() returns for an unknown terminal], [vim_cv_tgetent],
+  [
+    AC_RUN_IFELSE([AC_LANG_SOURCE([[
+#include "confdefs.h"
+#ifdef HAVE_TERMCAP_H
+# include <termcap.h>
+#endif
+#if STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#endif
+int main()
+{char s[10000]; int res = tgetent(s, "thisterminaldoesnotexist"); exit(res != 0); }
+    ]])],[
+      vim_cv_tgetent=zero
+    ],[
+      vim_cv_tgetent=non-zero
+    ],[
+      AC_MSG_ERROR(failed to compile test program.)
+    ])
+  ])
+
+if test "x$vim_cv_tgetent" = "xzero" ; then
+  AC_DEFINE(TGETENT_ZERO_ERR, 0)
+fi
+
+AC_MSG_CHECKING(whether termcap.h contains ospeed)
+AC_LINK_IFELSE([AC_LANG_PROGRAM([
+#ifdef HAVE_TERMCAP_H
+# include <termcap.h>
+#endif
+			], [ospeed = 20000])],
+	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_OSPEED),
+	[AC_MSG_RESULT(no)
+	AC_MSG_CHECKING(whether ospeed can be extern)
+	AC_LINK_IFELSE([AC_LANG_PROGRAM([
+#ifdef HAVE_TERMCAP_H
+# include <termcap.h>
+#endif
+extern short ospeed;
+			], [ospeed = 20000])],
+		AC_MSG_RESULT(yes); AC_DEFINE(OSPEED_EXTERN),
+		AC_MSG_RESULT(no))]
+	)
+
+AC_MSG_CHECKING([whether termcap.h contains UP, BC and PC])
+AC_LINK_IFELSE([AC_LANG_PROGRAM([
+#ifdef HAVE_TERMCAP_H
+# include <termcap.h>
+#endif
+			], [if (UP == 0 && BC == 0) PC = 1])],
+	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_UP_BC_PC),
+	[AC_MSG_RESULT(no)
+	AC_MSG_CHECKING([whether UP, BC and PC can be extern])
+	AC_LINK_IFELSE([AC_LANG_PROGRAM([
+#ifdef HAVE_TERMCAP_H
+# include <termcap.h>
+#endif
+extern char *UP, *BC, PC;
+			], [if (UP == 0 && BC == 0) PC = 1])],
+		AC_MSG_RESULT(yes); AC_DEFINE(UP_BC_PC_EXTERN),
+		AC_MSG_RESULT(no))]
+	)
+
+AC_MSG_CHECKING(whether tputs() uses outfuntype)
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
+#ifdef HAVE_TERMCAP_H
+# include <termcap.h>
+#endif
+			], [extern int xx(); tputs("test", 1, (outfuntype)xx)])],
+	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_OUTFUNTYPE),
+	AC_MSG_RESULT(no))
+
+AC_MSG_CHECKING([whether del_curterm() can be used])
+AC_LINK_IFELSE([AC_LANG_PROGRAM([
+#ifdef HAVE_TERMCAP_H
+# include <termcap.h>
+#endif
+#include <term.h>
+			], [if (cur_term) del_curterm(cur_term);])],
+	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_DEL_CURTERM),
+	AC_MSG_RESULT(no))
+
+dnl On some SCO machines sys/select redefines struct timeval
+AC_MSG_CHECKING([whether sys/select.h and sys/time.h may both be included])
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/select.h>], )],
+	  AC_MSG_RESULT(yes)
+			AC_DEFINE(SYS_SELECT_WITH_SYS_TIME),
+	  AC_MSG_RESULT(no))
+
+dnl Checks for pty.c (copied from screen) ==========================
+AC_MSG_CHECKING(for /dev/ptc)
+if test -r /dev/ptc; then
+  AC_DEFINE(HAVE_DEV_PTC)
+  AC_MSG_RESULT(yes)
+else
+  AC_MSG_RESULT(no)
+fi
+
+AC_MSG_CHECKING(for SVR4 ptys)
+if test -c /dev/ptmx ; then
+  AC_LINK_IFELSE([AC_LANG_PROGRAM([
+// These should be in stdlib.h, but it depends on _XOPEN_SOURCE.
+char *ptsname(int);
+int unlockpt(int);
+int grantpt(int);
+	       ], [
+		ptsname(0);
+		grantpt(0);
+		unlockpt(0);])],
+	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_SVR4_PTYS),
+	AC_MSG_RESULT(no))
+else
+  AC_MSG_RESULT(no)
+fi
+
+AC_MSG_CHECKING(for ptyranges)
+if test -d /dev/ptym ; then
+  pdir='/dev/ptym'
+else
+  pdir='/dev'
+fi
+dnl SCO uses ptyp%d
+AC_EGREP_CPP(yes,
+[#ifdef M_UNIX
+   yes;
+#endif
+	], ptys=`echo /dev/ptyp??`, ptys=`echo $pdir/pty??`)
+dnl if test -c /dev/ptyp19; then
+dnl ptys=`echo /dev/ptyp??`
+dnl else
+dnl ptys=`echo $pdir/pty??`
+dnl fi
+if test "$ptys" != "$pdir/pty??" ; then
+  p0=`echo $ptys | tr ' ' '\012' | sed -e 's/^.*\(.\).$/\1/g' | sort -u | tr -d '\012'`
+  p1=`echo $ptys | tr ' ' '\012' | sed -e 's/^.*\(.\)$/\1/g'  | sort -u | tr -d '\012'`
+  AC_DEFINE_UNQUOTED(PTYRANGE0,"$p0")
+  AC_DEFINE_UNQUOTED(PTYRANGE1,"$p1")
+  AC_MSG_RESULT([$p0 / $p1])
+else
+  AC_MSG_RESULT([don't know])
+fi
+
+dnl Checks for library functions. ===================================
+
+dnl check if struct sigcontext is defined (used for SGI only)
+AC_MSG_CHECKING(for struct sigcontext)
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
+#include <signal.h>
+int test_sig()
+{
+    struct sigcontext *scont;
+    scont = (struct sigcontext *)0;
+    return 1;
+} ], )],
+	  AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_SIGCONTEXT),
+	  AC_MSG_RESULT(no))
+
+dnl tricky stuff: try to find out if getcwd() is implemented with
+dnl system("sh -c pwd")
+AC_CACHE_CHECK([getcwd implementation is broken], [vim_cv_getcwd_broken],
+  [
+    AC_RUN_IFELSE([AC_LANG_SOURCE([[
+#include "confdefs.h"
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+char *dagger[] = { "IFS=pwd", 0 };
+int main()
+{
+  char buffer[500];
+  extern char **environ;
+  environ = dagger;
+  return getcwd(buffer, 500) ? 0 : 1;
+}
+    ]])],[
+      vim_cv_getcwd_broken=no
+    ],[
+      vim_cv_getcwd_broken=yes
+    ],[
+      AC_MSG_ERROR(cross-compiling: please set 'vim_cv_getcwd_broken')
+    ])
+  ])
+
+if test "x$vim_cv_getcwd_broken" = "xyes" ; then
+  AC_DEFINE(BAD_GETCWD)
+  AC_CHECK_FUNCS(getwd)
+fi
+
+dnl Check for functions in one big call, to reduce the size of configure.
+dnl Can only be used for functions that do not require any include.
+AC_CHECK_FUNCS(fchdir fchown fchmod fsync getcwd getpseudotty \
+	getpwent getpwnam getpwuid getrlimit gettimeofday localtime_r lstat \
+	memset mkdtemp nanosleep opendir putenv qsort readlink select setenv \
+	getpgid setpgid setsid sigaltstack sigstack sigset sigsetjmp sigaction \
+	sigprocmask sigvec strcasecmp strcoll strerror strftime stricmp strncasecmp \
+	strnicmp strpbrk strptime strtol tgetent towlower towupper iswupper \
+	tzset usleep utime utimes mblen ftruncate unsetenv posix_openpt \
+	clock_gettime)
+AC_FUNC_SELECT_ARGTYPES
+AC_FUNC_FSEEKO
+
+dnl define _LARGE_FILES, _FILE_OFFSET_BITS and _LARGEFILE_SOURCE when
+dnl appropriate, so that off_t is 64 bits when needed.
+AC_SYS_LARGEFILE
+
+AC_MSG_CHECKING(--enable-canberra argument)
+AC_ARG_ENABLE(canberra,
+	[  --disable-canberra      Do not use libcanberra.],
+	, [enable_canberra="maybe"])
+
+if test "$enable_canberra" = "maybe"; then
+  if test "$features" = "huge"; then
+    AC_MSG_RESULT(Defaulting to yes)
+    enable_canberra="yes"
+  else
+    AC_MSG_RESULT(Defaulting to no)
+    enable_canberra="no"
+  fi
+else
+  if test "$enable_canberra" = "yes" -a "$has_eval" = "no"; then
+    AC_MSG_RESULT([cannot use sound with tiny features])
+    enable_canberra="no"
+  else
+    AC_MSG_RESULT($enable_canberra)
+  fi
+fi
+if test "$enable_canberra" = "yes"; then
+  if test "x$PKG_CONFIG" != "xno"; then
+    canberra_lib=`$PKG_CONFIG --libs libcanberra 2>/dev/null`
+    canberra_cflags=`$PKG_CONFIG --cflags libcanberra 2>/dev/null`
+  fi
+  if test "x$canberra_lib" = "x"; then
+    canberra_lib=-lcanberra
+    canberra_cflags=-D_REENTRANT
+  fi
+  AC_MSG_CHECKING(for libcanberra)
+  ac_save_CFLAGS="$CFLAGS"
+  ac_save_LIBS="$LIBS"
+  if `echo "$CFLAGS" | grep -v "$canberra_cflags" 2>/dev/null`; then
+    CFLAGS="$CFLAGS $canberra_cflags"
+  fi
+  LIBS="$LIBS $canberra_lib"
+  AC_LINK_IFELSE([AC_LANG_PROGRAM([
+  # include <canberra.h>
+      ], [
+     ca_context *hello;
+     ca_context_create(&hello);])],
+       AC_MSG_RESULT(yes); AC_DEFINE(HAVE_CANBERRA),
+       AC_MSG_RESULT(no; try installing libcanberra-dev); CFLAGS="$ac_save_CFLAGS"; LIBS="$ac_save_LIBS")
+fi
+
+AC_MSG_CHECKING(--enable-libsodium argument)
+AC_ARG_ENABLE(libsodium,
+	[  --disable-libsodium      Do not use libsodium.],
+	, [enable_libsodium="maybe"])
+
+if test "$enable_libsodium" = "maybe"; then
+  if test "$features" = "huge"; then
+    AC_MSG_RESULT(Defaulting to yes)
+    enable_libsodium="yes"
+  else
+    AC_MSG_RESULT(Defaulting to no)
+    enable_libsodium="no"
+  fi
+else
+  AC_MSG_RESULT($enable_libsodium)
+fi
+if test "$enable_libsodium" = "yes"; then
+  if test "x$PKG_CONFIG" != "xno"; then
+    libsodium_lib=`$PKG_CONFIG --libs libsodium 2>/dev/null`
+    libsodium_cflags=`$PKG_CONFIG --cflags libsodium 2>/dev/null`
+  fi
+  if test "x$libsodium_lib" = "x"; then
+    libsodium_lib=-lsodium
+    libsodium_cflags=
+  fi
+  AC_MSG_CHECKING(for libsodium)
+  ac_save_CFLAGS="$CFLAGS"
+  ac_save_LIBS="$LIBS"
+  CFLAGS="$CFLAGS $libsodium_cflags"
+  LIBS="$LIBS $libsodium_lib"
+  AC_LINK_IFELSE([AC_LANG_PROGRAM([
+  # include <sodium.h>
+      ], [
+     printf("%d", sodium_init()); ])],
+       AC_MSG_RESULT(yes); AC_DEFINE(HAVE_SODIUM),
+       AC_MSG_RESULT(no; try installing libsodium-dev); CFLAGS="$ac_save_CFLAGS"; LIBS="$ac_save_LIBS")
+fi
+
+dnl fstatfs() can take 2 to 4 arguments, try to use st_blksize if possible
+AC_MSG_CHECKING(for st_blksize)
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+[#include <sys/types.h>
+#include <sys/stat.h>],
+[	struct stat st;
+	int n;
+
+	stat("/", &st);
+	n = (int)st.st_blksize;])],
+	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_ST_BLKSIZE),
+	AC_MSG_RESULT(no))
+
+dnl Check for timer_create. It probably requires the 'rt' library.
+dnl Run the program to find out if timer_create(CLOCK_MONOTONIC) actually
+dnl works, on Solaris timer_create() exists but fails at runtime.
+AC_CACHE_CHECK([for timer_create without -lrt], [vim_cv_timer_create], [
+AC_RUN_IFELSE([AC_LANG_PROGRAM([
+#if STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#endif
+#include <signal.h>
+#include <time.h>
+static void set_flag(union sigval sv) {}
+], [
+  struct timespec ts;
+  struct sigevent action = {0};
+  timer_t timer_id;
+
+  action.sigev_notify = SIGEV_THREAD;
+  action.sigev_notify_function = set_flag;
+  if (timer_create(CLOCK_MONOTONIC, &action, &timer_id) < 0)
+    exit(1);  // cannot create a monotonic timer
+  ])],
+  vim_cv_timer_create=yes,
+  vim_cv_timer_create=no,
+  AC_MSG_WARN([failed to build test program; if cross-compiling please set 'vim_cv_timer_create'])
+  )])
+
+dnl If the previous failed, check for timer_create() and linking with -lrt.
+if test "x$vim_cv_timer_create" = "xno" ; then
+  save_LIBS="$LIBS"
+  LIBS="$LIBS -lrt"
+  AC_CACHE_CHECK([for timer_create with -lrt], [vim_cv_timer_create_with_lrt], [
+    AC_RUN_IFELSE([AC_LANG_PROGRAM([
+    #if STDC_HEADERS
+    # include <stdlib.h>
+    # include <stddef.h>
+    #endif
+    #include <signal.h>
+    #include <time.h>
+    static void set_flag(union sigval sv) {}
+    ], [
+      struct timespec ts;
+      struct sigevent action = {0};
+      timer_t timer_id;
+
+      action.sigev_notify = SIGEV_THREAD;
+      action.sigev_notify_function = set_flag;
+      if (timer_create(CLOCK_MONOTONIC, &action, &timer_id) < 0)
+	exit(1);  // cannot create a monotonic timer
+      ])],
+      vim_cv_timer_create_with_lrt=yes,
+      vim_cv_timer_create_with_lrt=no,
+      AC_MSG_WARN([failed to build test program; if cross-compiling please set 'vim_cv_timer_create_with_lrt'])
+    )])
+  LIBS="$save_LIBS"
+else
+  vim_cv_timer_create_with_lrt=no
+fi
+
+if test "x$vim_cv_timer_create" = "xyes" ; then
+  AC_DEFINE(HAVE_TIMER_CREATE)
+fi
+if test "x$vim_cv_timer_create_with_lrt" = "xyes" ; then
+  AC_DEFINE(HAVE_TIMER_CREATE)
+  LIBS="$LIBS -lrt"
+fi
+
+AC_CACHE_CHECK([whether stat() ignores a trailing slash], [vim_cv_stat_ignores_slash],
+  [
+    AC_RUN_IFELSE([AC_LANG_SOURCE([[
+#include "confdefs.h"
+#if STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#endif
+#include <sys/types.h>
+#include <sys/stat.h>
+int main() {struct stat st;  exit(stat("configure/", &st) != 0); }
+    ]])],[
+      vim_cv_stat_ignores_slash=yes
+    ],[
+      vim_cv_stat_ignores_slash=no
+    ],[
+      AC_MSG_ERROR(cross-compiling: please set 'vim_cv_stat_ignores_slash')
+    ])
+  ])
+
+if test "x$vim_cv_stat_ignores_slash" = "xyes" ; then
+  AC_DEFINE(STAT_IGNORES_SLASH)
+fi
+
+dnl nanoseconds field of struct stat
+AC_CACHE_CHECK([for nanoseconds field of struct stat],
+  ac_cv_struct_st_mtim_nsec,
+  [ac_save_CPPFLAGS="$CPPFLAGS"
+   ac_cv_struct_st_mtim_nsec=no
+   # st_mtim.tv_nsec -- the usual case
+   # st_mtim._tv_nsec -- Solaris 2.6, if
+   #	(defined _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED == 1
+   #	 && !defined __EXTENSIONS__)
+   # st_mtim.st__tim.tv_nsec -- UnixWare 2.1.2
+   # st_mtime_n -- AIX 5.2 and above
+   # st_mtimespec.tv_nsec -- Darwin (Mac OSX)
+   for ac_val in st_mtim.tv_nsec st_mtim._tv_nsec st_mtim.st__tim.tv_nsec st_mtime_n st_mtimespec.tv_nsec; do
+     CPPFLAGS="$ac_save_CPPFLAGS -DST_MTIM_NSEC=$ac_val"
+     AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <sys/types.h>
+#include <sys/stat.h>], [struct stat s; s.ST_MTIM_NSEC;])],
+       [ac_cv_struct_st_mtim_nsec=$ac_val; break])
+   done
+   CPPFLAGS="$ac_save_CPPFLAGS"
+])
+if test $ac_cv_struct_st_mtim_nsec != no; then
+  AC_DEFINE_UNQUOTED([ST_MTIM_NSEC], [$ac_cv_struct_st_mtim_nsec],
+  [Define if struct stat contains a nanoseconds field])
+fi
+
+dnl Link with iconv for charset translation, if not found without library.
+dnl check for iconv() requires including iconv.h
+dnl Add "-liconv" when possible; Solaris has iconv but use GNU iconv when it
+dnl has been installed.
+AC_MSG_CHECKING(for iconv_open())
+save_LIBS="$LIBS"
+LIBS="$LIBS -liconv"
+AC_LINK_IFELSE([AC_LANG_PROGRAM([
+#ifdef HAVE_ICONV_H
+# include <iconv.h>
+#endif
+    ], [iconv_open("fr", "to");])],
+    AC_MSG_RESULT(yes; with -liconv); AC_DEFINE(HAVE_ICONV),
+    LIBS="$save_LIBS"
+    AC_LINK_IFELSE([AC_LANG_PROGRAM([
+#ifdef HAVE_ICONV_H
+# include <iconv.h>
+#endif
+	], [iconv_open("fr", "to");])],
+	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_ICONV),
+	AC_MSG_RESULT(no)))
+
+
+AC_MSG_CHECKING(for nl_langinfo(CODESET))
+AC_LINK_IFELSE([AC_LANG_PROGRAM([
+#ifdef HAVE_LANGINFO_H
+# include <langinfo.h>
+#endif
+], [char *cs = nl_langinfo(CODESET);])],
+	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_NL_LANGINFO_CODESET),
+	AC_MSG_RESULT(no))
+
+dnl Floating point support may require the "m" library
+AC_CHECK_LIB(m, strtod)
+
+dnl isinf() and isnan() need to include header files and may need -lm.
+AC_MSG_CHECKING([for isinf()])
+AC_LINK_IFELSE([AC_LANG_PROGRAM([
+#ifdef HAVE_MATH_H
+# include <math.h>
+#endif
+#if STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#endif
+], [int r = isinf(1.11); ])],
+	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_ISINF),
+	AC_MSG_RESULT(no))
+
+AC_MSG_CHECKING([for isnan()])
+AC_LINK_IFELSE([AC_LANG_PROGRAM([
+#ifdef HAVE_MATH_H
+# include <math.h>
+#endif
+#if STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#endif
+], [int r = isnan(1.11); ])],
+	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_ISNAN),
+	AC_MSG_RESULT(no))
+
+dnl Link with -lposix1e for ACL stuff; if not found, try -lacl for SGI
+dnl when -lacl works, also try to use -lattr (required for Debian).
+dnl On Solaris, use the acl_get/set functions in libsec, if present.
+AC_MSG_CHECKING(--disable-acl argument)
+AC_ARG_ENABLE(acl,
+	[  --disable-acl           No check for ACL support.],
+	, [enable_acl="yes"])
+if test "$enable_acl" = "yes"; then
+  AC_MSG_RESULT(no)
+  AC_CHECK_LIB(posix1e, acl_get_file, [LIBS="$LIBS -lposix1e"],
+	AC_CHECK_LIB(acl, acl_get_file, [LIBS="$LIBS -lacl"
+		  AC_CHECK_LIB(attr, fgetxattr, LIBS="$LIBS -lattr",,)],,),)
+
+  AC_MSG_CHECKING(for POSIX ACL support)
+  AC_LINK_IFELSE([AC_LANG_PROGRAM([
+#include <sys/types.h>
+#ifdef HAVE_SYS_ACL_H
+# include <sys/acl.h>
+#endif
+acl_t acl;], [acl = acl_get_file("foo", ACL_TYPE_ACCESS);
+	acl_set_file("foo", ACL_TYPE_ACCESS, acl);
+	acl_free(acl);])],
+	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_POSIX_ACL),
+	AC_MSG_RESULT(no))
+
+  AC_CHECK_LIB(sec, acl_get, [LIBS="$LIBS -lsec"; AC_DEFINE(HAVE_SOLARIS_ZFS_ACL)],
+  AC_MSG_CHECKING(for Solaris ACL support)
+  AC_LINK_IFELSE([AC_LANG_PROGRAM([
+#ifdef HAVE_SYS_ACL_H
+# include <sys/acl.h>
+#endif], [acl("foo", GETACLCNT, 0, NULL);
+	])],
+	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_SOLARIS_ACL),
+	AC_MSG_RESULT(no)))
+
+  AC_MSG_CHECKING(for AIX ACL support)
+  AC_LINK_IFELSE([AC_LANG_PROGRAM([
+#if STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#endif
+#ifdef HAVE_SYS_ACL_H
+# include <sys/acl.h>
+#endif
+#ifdef HAVE_SYS_ACCESS_H
+# include <sys/access.h>
+#endif
+#define _ALL_SOURCE
+
+#include <sys/stat.h>
+
+int aclsize;
+struct acl *aclent;], [aclsize = sizeof(struct acl);
+	aclent = (void *)malloc(aclsize);
+	statacl("foo", STX_NORMAL, aclent, aclsize);
+	])],
+	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_AIX_ACL),
+	AC_MSG_RESULT(no))
+else
+  AC_MSG_RESULT(yes)
+fi
+
+if test "x$GTK_CFLAGS" != "x"; then
+  dnl pango_shape_full() is new, fall back to pango_shape().
+  AC_MSG_CHECKING(for pango_shape_full)
+  ac_save_CFLAGS="$CFLAGS"
+  ac_save_LIBS="$LIBS"
+  CFLAGS="$CFLAGS $GTK_CFLAGS"
+  LIBS="$LIBS $GTK_LIBS"
+  AC_LINK_IFELSE([AC_LANG_PROGRAM(
+  [#include <gtk/gtk.h>],
+  [ pango_shape_full(NULL, 0, NULL, 0, NULL, NULL); ])],
+	  AC_MSG_RESULT(yes); AC_DEFINE(HAVE_PANGO_SHAPE_FULL),
+	  AC_MSG_RESULT(no))
+  CFLAGS="$ac_save_CFLAGS"
+  LIBS="$ac_save_LIBS"
+fi
+
+AC_MSG_CHECKING(--enable-gpm argument)
+AC_ARG_ENABLE(gpm,
+	[  --enable-gpm=OPTS       Use gpm (Linux mouse daemon). default=yes OPTS=yes/no/dynamic], ,
+	[enable_gpm="yes"])
+
+if test "$enable_gpm" = "yes" -o "$enable_gpm" = "dynamic"; then
+  AC_MSG_RESULT($enable_gpm)
+  dnl Checking if gpm support can be compiled
+  AC_CACHE_CHECK([for gpm], vi_cv_have_gpm,
+	[olibs="$LIBS" ; LIBS="-lgpm"]
+	AC_LINK_IFELSE([AC_LANG_PROGRAM(
+	    [#include <gpm.h>
+	    #include <linux/keyboard.h>],
+	    [Gpm_GetLibVersion(NULL);])],
+	    dnl Configure defines HAVE_GPM, if it is defined feature.h defines
+	    dnl FEAT_MOUSE_GPM if mouse support is included
+	    [vi_cv_have_gpm=yes],
+	    [vi_cv_have_gpm=no])
+	[LIBS="$olibs"]
+    )
+  if test $vi_cv_have_gpm = yes; then
+    if test "$enable_gpm" = "yes"; then
+      LIBS="$LIBS -lgpm"
+    else
+      AC_DEFINE(DYNAMIC_GPM)
+    fi
+    AC_DEFINE(HAVE_GPM)
+  fi
+else
+  AC_MSG_RESULT(no)
+fi
+
+AC_MSG_CHECKING(--disable-sysmouse argument)
+AC_ARG_ENABLE(sysmouse,
+	[  --disable-sysmouse      Don't use sysmouse (mouse in *BSD console).], ,
+	[enable_sysmouse="yes"])
+
+if test "$enable_sysmouse" = "yes"; then
+  AC_MSG_RESULT(no)
+  dnl Checking if sysmouse support can be compiled
+  dnl Configure defines HAVE_SYSMOUSE, if it is defined feature.h
+  dnl defines FEAT_SYSMOUSE if mouse support is included
+  AC_CACHE_CHECK([for sysmouse], vi_cv_have_sysmouse,
+	AC_LINK_IFELSE([AC_LANG_PROGRAM(
+	    [#include <sys/consio.h>
+	     #include <signal.h>
+	     #include <sys/fbio.h>],
+	    [struct mouse_info   mouse;
+	     mouse.operation = MOUSE_MODE;
+	     mouse.operation = MOUSE_SHOW;
+	     mouse.u.mode.mode = 0;
+	     mouse.u.mode.signal = SIGUSR2;])],
+	    [vi_cv_have_sysmouse=yes],
+	    [vi_cv_have_sysmouse=no])
+    )
+  if test $vi_cv_have_sysmouse = yes; then
+    AC_DEFINE(HAVE_SYSMOUSE)
+  fi
+else
+  AC_MSG_RESULT(yes)
+fi
+
+dnl make sure the FD_CLOEXEC flag for fcntl()'s F_SETFD command is known
+AC_MSG_CHECKING(for FD_CLOEXEC)
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+[#if HAVE_FCNTL_H
+# include <fcntl.h>
+#endif],
+[	int flag = FD_CLOEXEC;])],
+	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_FD_CLOEXEC),
+	AC_MSG_RESULT(not usable))
+
+dnl rename needs to be checked separately to work on Nextstep with cc
+AC_MSG_CHECKING(for rename)
+AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <stdio.h>], [rename("this", "that")])],
+	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_RENAME),
+	AC_MSG_RESULT(no))
+
+dnl check for dirfd()
+AC_MSG_CHECKING(for dirfd)
+AC_LINK_IFELSE([AC_LANG_PROGRAM(
+[#include <sys/types.h>
+#include <dirent.h>],
+[DIR * dir=opendir("dirname"); dirfd(dir);])],
+AC_MSG_RESULT(yes); AC_DEFINE(HAVE_DIRFD), AC_MSG_RESULT(not usable))
+
+dnl check for flock()
+AC_MSG_CHECKING(for flock)
+AC_LINK_IFELSE([AC_LANG_PROGRAM(
+[#include <sys/file.h>],
+[flock(10, LOCK_SH);])],
+AC_MSG_RESULT(yes); AC_DEFINE(HAVE_FLOCK), AC_MSG_RESULT(not usable))
+
+dnl sysctl() may exist but not the arguments we use
+AC_MSG_CHECKING(for sysctl)
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+[#include <sys/types.h>
+#include <sys/sysctl.h>],
+[[	int mib[2], r;
+	size_t len;
+
+	mib[0] = CTL_HW;
+	mib[1] = HW_USERMEM;
+	len = sizeof(r);
+	(void)sysctl(mib, 2, &r, &len, (void *)0, (size_t)0);
+	]])],
+	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_SYSCTL),
+	AC_MSG_RESULT(not usable))
+
+dnl sysinfo() may exist but not be Linux compatible.
+dnl On some FreeBSD systems it may depend on libsysinfo, try to link
+AC_MSG_CHECKING(for sysinfo)
+AC_LINK_IFELSE([AC_LANG_PROGRAM(
+[#include <sys/types.h>
+#include <sys/sysinfo.h>],
+[	struct sysinfo sinfo;
+	int t;
+
+	(void)sysinfo(&sinfo);
+	t = sinfo.totalram;
+	])],
+	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_SYSINFO),
+	AC_MSG_RESULT(not usable))
+
+dnl struct sysinfo may have the mem_unit field or not
+AC_MSG_CHECKING(for sysinfo.mem_unit)
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+[#include <sys/types.h>
+#include <sys/sysinfo.h>],
+[	struct sysinfo sinfo;
+	sinfo.mem_unit = 1;
+	])],
+	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_SYSINFO_MEM_UNIT),
+	AC_MSG_RESULT(no))
+
+dnl struct sysinfo may have the uptime field or not
+AC_MSG_CHECKING(for sysinfo.uptime)
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+[#include <sys/types.h>
+#include <sys/sysinfo.h>],
+[	struct sysinfo sinfo;
+        long ut;
+
+	(void)sysinfo(&sinfo);
+	ut = sinfo.uptime;
+	])],
+	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_SYSINFO_UPTIME),
+	AC_MSG_RESULT(no))
+
+dnl sysconf() may exist but not support what we want to use
+AC_MSG_CHECKING(for sysconf)
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+[#include <unistd.h>],
+[	(void)sysconf(_SC_PAGESIZE);
+	(void)sysconf(_SC_PHYS_PAGES);
+	])],
+	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_SYSCONF),
+	AC_MSG_RESULT(not usable))
+
+dnl check if we have _SC_SIGSTKSZ via sysconf()
+AC_MSG_CHECKING(for _SC_SIGSTKSZ via sysconf())
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+[#include <unistd.h>],
+[	(void)sysconf(_SC_SIGSTKSZ);
+	])],
+	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_SYSCONF_SIGSTKSZ),
+	AC_MSG_RESULT(not usable))
+
+AC_CHECK_SIZEOF([int])
+AC_CHECK_SIZEOF([long])
+AC_CHECK_SIZEOF([time_t])
+AC_CHECK_SIZEOF([off_t])
+
+dnl Use different names to avoid clashing with other header files.
+AC_DEFINE_UNQUOTED(VIM_SIZEOF_INT, [$ac_cv_sizeof_int])
+AC_DEFINE_UNQUOTED(VIM_SIZEOF_LONG, [$ac_cv_sizeof_long])
+
+dnl Make sure that uint32_t is really 32 bits unsigned.
+AC_MSG_CHECKING([uint32_t is 32 bits])
+AC_RUN_IFELSE([AC_LANG_SOURCE([
+#ifdef HAVE_STDINT_H
+# include <stdint.h>
+#endif
+#ifdef HAVE_INTTYPES_H
+# include <inttypes.h>
+#endif
+int main() {
+  uint32_t nr1 = (uint32_t)-1;
+  uint32_t nr2 = (uint32_t)0xffffffffUL;
+  if (sizeof(uint32_t) != 4 || nr1 != 0xffffffffUL || nr2 + 1 != 0) return 1;
+  return 0;
+}])],
+AC_MSG_RESULT(ok),
+AC_MSG_ERROR([WRONG!  uint32_t not defined correctly.]),
+AC_MSG_WARN([cannot check uint32_t when cross-compiling.]))
+
+dnl Check for memmove() before bcopy(), makes memmove() be used when both are
+dnl present, fixes problem with incompatibility between Solaris 2.4 and 2.5.
+
+[bcopy_test_prog='
+#include "confdefs.h"
+#ifdef HAVE_STRING_H
+# include <string.h>
+#endif
+#if STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#endif
+int main() {
+  char buf[10];
+  strcpy(buf, "abcdefghi");
+  mch_memmove(buf, buf + 2, 3);
+  if (strncmp(buf, "ababcf", 6))
+    exit(1);
+  strcpy(buf, "abcdefghi");
+  mch_memmove(buf + 2, buf, 3);
+  if (strncmp(buf, "cdedef", 6))
+    exit(1);
+  exit(0); /* libc version works properly.  */
+}']
+
+AC_CACHE_CHECK([whether memmove handles overlaps],[vim_cv_memmove_handles_overlap],
+  [
+    AC_RUN_IFELSE([AC_LANG_SOURCE([[#define mch_memmove(s,d,l) memmove(d,s,l) $bcopy_test_prog]])],
+      [
+	vim_cv_memmove_handles_overlap=yes
+      ],[
+	vim_cv_memmove_handles_overlap=no
+      ],[
+	AC_MSG_ERROR(cross-compiling: please set 'vim_cv_memmove_handles_overlap')
+      ])
+  ])
+
+if test "x$vim_cv_memmove_handles_overlap" = "xyes" ; then
+  AC_DEFINE(USEMEMMOVE)
+else
+  AC_CACHE_CHECK([whether bcopy handles overlaps],[vim_cv_bcopy_handles_overlap],
+    [
+      AC_RUN_IFELSE([AC_LANG_SOURCE([[#define mch_bcopy(s,d,l) bcopy(d,s,l) $bcopy_test_prog]])],
+      [
+	vim_cv_bcopy_handles_overlap=yes
+      ],[
+	vim_cv_bcopy_handles_overlap=no
+      ],[
+	AC_MSG_ERROR(cross-compiling: please set 'vim_cv_bcopy_handles_overlap')
+      ])
+    ])
+
+  if test "x$vim_cv_bcopy_handles_overlap" = "xyes" ; then
+    AC_DEFINE(USEBCOPY)
+  else
+    AC_CACHE_CHECK([whether memcpy handles overlaps],[vim_cv_memcpy_handles_overlap],
+      [
+	AC_RUN_IFELSE([AC_LANG_SOURCE([[#define mch_memcpy(s,d,l) memcpy(d,s,l) $bcopy_test_prog]])],
+	  [
+	    vim_cv_memcpy_handles_overlap=yes
+	  ],[
+	    vim_cv_memcpy_handles_overlap=no
+	  ],[
+	    AC_MSG_ERROR(cross-compiling: please set 'vim_cv_memcpy_handles_overlap')
+	  ])
+      ])
+
+    if test "x$vim_cv_memcpy_handles_overlap" = "xyes" ; then
+      AC_DEFINE(USEMEMCPY)
+    fi
+  fi
+fi
+
+
+dnl Check for multibyte locale functions
+dnl Find out if _Xsetlocale() is supported by libX11.
+dnl Check if X_LOCALE should be defined.
+if test "x$with_x" = "xyes"; then
+  cflags_save=$CFLAGS
+  libs_save=$LIBS
+  LIBS="$LIBS $X_LIBS $GUI_LIB_LOC $GUI_X_LIBS $X_PRE_LIBS $X_LIB $X_EXTRA_LIBS"
+  CFLAGS="$CFLAGS $X_CFLAGS"
+
+  AC_MSG_CHECKING(whether X_LOCALE needed)
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <X11/Xlocale.h>],)],
+      AC_LINK_IFELSE([AC_LANG_CALL([],[_Xsetlocale])], [AC_MSG_RESULT(yes)
+	      AC_DEFINE(X_LOCALE)], AC_MSG_RESULT(no)),
+      AC_MSG_RESULT(no))
+
+  AC_MSG_CHECKING(whether Xutf8SetWMProperties() can be used)
+  AC_LINK_IFELSE([AC_LANG_CALL([],[Xutf8SetWMProperties])], [AC_MSG_RESULT(yes)
+	      AC_DEFINE(HAVE_XUTF8SETWMPROPERTIES)], AC_MSG_RESULT(no))
+
+  CFLAGS=$cflags_save
+  LIBS=$libs_save
+fi
+
+dnl Link with xpg4, it is said to make Korean locale working
+AC_CHECK_LIB(xpg4, _xpg4_setrunelocale, [LIBS="$LIBS -lxpg4"],,)
+
+dnl Check how we can run ctags.  Default to "ctags" when nothing works.
+dnl Use --version to detect Exuberant ctags (preferred)
+dnl       Add --fields=+S to get function signatures for omni completion.
+dnl -t for typedefs (many ctags have this)
+dnl -s for static functions (Elvis ctags only?)
+dnl -v for variables. Dangerous, most ctags take this for 'vgrind style'.
+dnl -i+m to test for older Exuberant ctags
+AC_MSG_CHECKING(how to create tags)
+test -f tags && mv tags tags.save
+if (eval ctags --version /dev/null | grep Exuberant) < /dev/null 1>&AS_MESSAGE_LOG_FD 2>&1; then
+  TAGPRG="ctags -I INIT+,INIT2+,INIT3+,INIT4+,INIT5+ --fields=+S"
+elif (eval exctags --version /dev/null | grep Exuberant) < /dev/null 1>&AS_MESSAGE_LOG_FD 2>&1; then
+  TAGPRG="exctags -I INIT+,INIT2+,INIT3+,INIT4+,INIT5+ --fields=+S"
+elif (eval exuberant-ctags --version /dev/null | grep Exuberant) < /dev/null 1>&AS_MESSAGE_LOG_FD 2>&1; then
+  TAGPRG="exuberant-ctags -I INIT+,INIT2+,INIT3+,INIT4+,INIT5+ --fields=+S"
+else
+  TAGPRG="ctags"
+  (eval etags	   /dev/null) < /dev/null 1>&AS_MESSAGE_LOG_FD 2>&1 && TAGPRG="etags"
+  (eval etags -c   /dev/null) < /dev/null 1>&AS_MESSAGE_LOG_FD 2>&1 && TAGPRG="etags -c"
+  (eval ctags	   /dev/null) < /dev/null 1>&AS_MESSAGE_LOG_FD 2>&1 && TAGPRG="ctags"
+  (eval ctags -t   /dev/null) < /dev/null 1>&AS_MESSAGE_LOG_FD 2>&1 && TAGPRG="ctags -t"
+  (eval ctags -ts  /dev/null) < /dev/null 1>&AS_MESSAGE_LOG_FD 2>&1 && TAGPRG="ctags -ts"
+  (eval ctags -tvs /dev/null) < /dev/null 1>&AS_MESSAGE_LOG_FD 2>&1 && TAGPRG="ctags -tvs"
+  (eval ctags -i+m /dev/null) < /dev/null 1>&AS_MESSAGE_LOG_FD 2>&1 && TAGPRG="ctags -i+m"
+fi
+test -f tags.save && mv tags.save tags
+AC_MSG_RESULT($TAGPRG) AC_SUBST(TAGPRG)
+
+dnl Check how we can run man with a section number
+AC_MSG_CHECKING(how to run man with a section nr)
+MANDEF="man"
+(eval MANPAGER=cat PAGER=cat man -s 2 read) < /dev/null > /dev/null 2>&AS_MESSAGE_LOG_FD && MANDEF="man -s"
+AC_MSG_RESULT($MANDEF)
+if test "$MANDEF" = "man -s"; then
+  AC_DEFINE(USEMAN_S)
+fi
+
+dnl Check if gettext() is working and if it needs -lintl
+dnl We take care to base this on an empty LIBS: on some systems libelf would be
+dnl in LIBS and implicitly take along libintl. The final LIBS would then not
+dnl contain libintl, and the link step would fail due to -Wl,--as-needed.
+AC_MSG_CHECKING(--disable-nls argument)
+AC_ARG_ENABLE(nls,
+	[  --disable-nls           Don't support NLS (gettext()).], ,
+	[enable_nls="yes"])
+
+if test "$enable_nls" = "yes"; then
+  AC_MSG_RESULT(no)
+
+  INSTALL_LANGS=install-languages
+  AC_SUBST(INSTALL_LANGS)
+  INSTALL_TOOL_LANGS=install-tool-languages
+  AC_SUBST(INSTALL_TOOL_LANGS)
+
+  AC_CHECK_PROG(MSGFMT, msgfmt, msgfmt, )
+  AC_MSG_CHECKING([for NLS])
+  if test -f po/Makefile; then
+    have_gettext="no"
+    if test -n "$MSGFMT"; then
+      olibs=$LIBS
+      LIBS=""
+      AC_LINK_IFELSE([AC_LANG_PROGRAM(
+	[#include <libintl.h>],
+	[gettext("Test");])],
+	AC_MSG_RESULT([gettext() works]); have_gettext="yes"; LIBS=$olibs,
+	  LIBS="-lintl"
+	  AC_LINK_IFELSE([AC_LANG_PROGRAM(
+	      [#include <libintl.h>],
+	      [gettext("Test");])],
+	      AC_MSG_RESULT([gettext() works with -lintl]); have_gettext="yes";
+	      LIBS="$olibs -lintl",
+	      AC_MSG_RESULT([gettext() doesn't work]);
+	      LIBS=$olibs))
+    else
+      AC_MSG_RESULT([msgfmt not found - disabled]);
+    fi
+    if test $have_gettext = "yes" -a "x$features" != "xtiny"; then
+      AC_DEFINE(HAVE_GETTEXT)
+      MAKEMO=yes
+      AC_SUBST(MAKEMO)
+      dnl this was added in GNU gettext 0.10.36
+      AC_CHECK_FUNCS(bind_textdomain_codeset)
+      dnl _nl_msg_cat_cntr is required for GNU gettext
+      AC_MSG_CHECKING([for _nl_msg_cat_cntr])
+      AC_LINK_IFELSE([AC_LANG_PROGRAM(
+		[#include <libintl.h>
+		extern int _nl_msg_cat_cntr;],
+		[++_nl_msg_cat_cntr;])],
+		AC_MSG_RESULT([yes]); AC_DEFINE(HAVE_NL_MSG_CAT_CNTR),
+		AC_MSG_RESULT([no]))
+      AC_MSG_CHECKING([if msgfmt supports --desktop])
+      MSGFMT_DESKTOP=
+      if "$MSGFMT" --help | grep -e '--desktop' >/dev/null; then
+	if "$MSGFMT" --version | grep '0.19.[[3-7]]$' >/dev/null; then
+	  dnl GNU gettext 0.19.7's --desktop is broken.  We assume back to
+	  dnl 0.19.3 is also broken.
+	  AC_MSG_RESULT([broken])
+	else
+	  AC_MSG_RESULT([yes])
+	  MSGFMT_DESKTOP="gvim.desktop vim.desktop"
+	fi
+      else
+	AC_MSG_RESULT([no])
+      fi
+      AC_SUBST(MSGFMT_DESKTOP)
+    fi
+  else
+    AC_MSG_RESULT([no "po/Makefile" - disabled]);
+  fi
+else
+  AC_MSG_RESULT(yes)
+fi
+
+dnl Check for dynamic linking loader
+AC_CHECK_HEADER(dlfcn.h, DLL=dlfcn.h, [AC_CHECK_HEADER(dl.h, DLL=dl.h)])
+if test x${DLL} = xdlfcn.h; then
+  AC_DEFINE(HAVE_DLFCN_H, 1, [ Define if we have dlfcn.h. ])
+  AC_MSG_CHECKING([for dlopen()])
+  AC_LINK_IFELSE([AC_LANG_PROGRAM(,[
+		extern void* dlopen();
+		dlopen();
+      ])],
+      AC_MSG_RESULT(yes);
+	      AC_DEFINE(HAVE_DLOPEN, 1, [ Define if we have dlopen() ]),
+      AC_MSG_RESULT(no);
+	      AC_MSG_CHECKING([for dlopen() in -ldl])
+	      olibs=$LIBS
+	      LIBS="$LIBS -ldl"
+	      AC_LINK_IFELSE([AC_LANG_PROGRAM(,[
+				extern void* dlopen();
+				dlopen();
+		 ])],
+		 AC_MSG_RESULT(yes);
+			  AC_DEFINE(HAVE_DLOPEN, 1, [ Define if we have dlopen() ]),
+		 AC_MSG_RESULT(no);
+			  LIBS=$olibs))
+  dnl ReliantUNIX has dlopen() in libc but everything else in libdl
+  dnl ick :-)
+  AC_MSG_CHECKING([for dlsym()])
+  AC_LINK_IFELSE([AC_LANG_PROGRAM(,[
+		extern void* dlsym();
+		dlsym();
+      ])],
+      AC_MSG_RESULT(yes);
+	      AC_DEFINE(HAVE_DLSYM, 1, [ Define if we have dlsym() ]),
+      AC_MSG_RESULT(no);
+	      AC_MSG_CHECKING([for dlsym() in -ldl])
+	      olibs=$LIBS
+	      LIBS="$LIBS -ldl"
+	      AC_LINK_IFELSE([AC_LANG_PROGRAM(,[
+				extern void* dlsym();
+				dlsym();
+		 ])],
+		 AC_MSG_RESULT(yes);
+			  AC_DEFINE(HAVE_DLSYM, 1, [ Define if we have dlsym() ]),
+		 AC_MSG_RESULT(no);
+			  LIBS=$olibs))
+elif test x${DLL} = xdl.h; then
+  AC_DEFINE(HAVE_DL_H, 1, [ Define if we have dl.h. ])
+  AC_MSG_CHECKING([for shl_load()])
+  AC_LINK_IFELSE([AC_LANG_PROGRAM(,[
+		extern void* shl_load();
+		shl_load();
+     ])],
+     AC_MSG_RESULT(yes);
+	  AC_DEFINE(HAVE_SHL_LOAD, 1, [ Define if we have shl_load() ]),
+     AC_MSG_RESULT(no);
+	  AC_MSG_CHECKING([for shl_load() in -ldld])
+	  olibs=$LIBS
+	  LIBS="$LIBS -ldld"
+	  AC_LINK_IFELSE([AC_LANG_PROGRAM(,[
+			extern void* shl_load();
+			shl_load();
+	     ])],
+	     AC_MSG_RESULT(yes);
+		  AC_DEFINE(HAVE_SHL_LOAD, 1, [ Define if we have shl_load() ]),
+	     AC_MSG_RESULT(no);
+		  LIBS=$olibs))
+fi
+AC_CHECK_HEADERS(setjmp.h)
+
+if test "x$MACOS_X" = "xyes" -a -n "$PERL"; then
+  dnl -ldl must come after DynaLoader.a
+  if echo $LIBS | grep -e '-ldl' >/dev/null; then
+    LIBS=`echo $LIBS | sed s/-ldl//`
+    PERL_LIBS="$PERL_LIBS -ldl"
+  fi
+fi
+
+if test "$MACOS_X" = "yes"; then
+  AC_MSG_CHECKING([whether we need macOS frameworks])
+  if test "$MACOS_X_DARWIN" = "yes"; then
+    if test "$features" = "tiny"; then
+      dnl Since no FEAT_CLIPBOARD or FEAT_SOUND, no need for os_macosx.m.
+      OS_EXTRA_SRC=`echo "$OS_EXTRA_SRC" | sed -e 's+os_macosx.m++'`
+      OS_EXTRA_OBJ=`echo "$OS_EXTRA_OBJ" | sed -e 's+objects/os_macosx.o++'`
+      AC_MSG_RESULT([yes, we need CoreServices])
+      LIBS="$LIBS -framework CoreServices"
+    else
+      AC_MSG_RESULT([yes, we need AppKit])
+      LIBS="$LIBS -framework AppKit"
+    fi
+  else
+    AC_MSG_RESULT([no])
+  fi
+fi
+
+dnl On some systems REENTRANT needs to be defined.  It should not hurt to use
+dnl it everywhere.
+if `echo "$CFLAGS" | grep -v D_REENTRANT >/dev/null`; then
+  CFLAGS="$CFLAGS -D_REENTRANT"
+fi
+
+dnl gcc 3.1 changed the meaning of -MM.  The only solution appears to be to
+dnl use "-isystem" instead of "-I" for all non-Vim include dirs.
+dnl But only when making dependencies, cproto and lint don't take "-isystem".
+dnl Mac gcc returns "powerpc-apple-darwin8-gcc-4.0.1 (GCC)...", need to allow
+dnl the number before the version number.
+DEPEND_CFLAGS_FILTER=
+if test "$GCC" = yes; then
+  AC_MSG_CHECKING(for GCC 3 or later)
+  gccmajor=`echo "$gccversion" | sed -e 's/^\([[1-9]][[0-9]]*\)\..*$/\1/g'`
+  if test "$gccmajor" -gt "2"; then
+    DEPEND_CFLAGS_FILTER="| sed 's+-I */+-isystem /+g'"
+    AC_MSG_RESULT(yes)
+  else
+    AC_MSG_RESULT(no)
+  fi
+  dnl -D_FORTIFY_SOURCE=2 crashes Vim on strcpy(buf, "000") when buf is
+  dnl declared as char x[1] but actually longer.  Introduced in gcc 4.0.
+  dnl Also remove duplicate _FORTIFY_SOURCE arguments.
+  dnl And undefine it first to avoid a warning.
+  AC_MSG_CHECKING(whether we need -D_FORTIFY_SOURCE=1)
+  if test "$gccmajor" -gt "3"; then
+    CFLAGS=`echo "$CFLAGS" | sed -e 's/-D_FORTIFY_SOURCE=.,//g' -e 's/ *-Wp,-D_FORTIFY_SOURCE=. / /g' -e 's/,-D_FORTIFY_SOURCE=. //g' -e 's/ *-D_FORTIFY_SOURCE=.//g' -e 's/ *-Wp,-U_FORTIFY_SOURCE/ /g' -e 's/ *-U_FORTIFY_SOURCE//g' -e 's/$/ -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1/'`
+    CPPFLAGS=`echo "$CPPFLAGS" | sed -e 's/-D_FORTIFY_SOURCE=.,//g' -e 's/ *-Wp,-D_FORTIFY_SOURCE=. / /g' -e 's/,-D_FORTIFY_SOURCE=. //g' -e 's/ *-D_FORTIFY_SOURCE=.//g' -e 's/ *-Wp,-U_FORTIFY_SOURCE/ /g' -e 's/ *-U_FORTIFY_SOURCE//g'`
+    AC_MSG_RESULT(yes)
+  else
+    AC_MSG_RESULT(no)
+  fi
+fi
+AC_SUBST(DEPEND_CFLAGS_FILTER)
+
+dnl On some systems AC_SYS_LARGEFILE determines that -D_FILE_OFFSET_BITS=64
+dnl isn't required, but the CFLAGS for some of the libraries we're using
+dnl include the define.  Since the define changes the size of some datatypes
+dnl (e.g. ino_t and off_t), all of Vim's modules must be compiled with a
+dnl consistent value.  It's therefore safest to force the use of the define
+dnl if it's present in any of the *_CFLAGS variables.
+AC_MSG_CHECKING(whether we need to force -D_FILE_OFFSET_BITS=64)
+if echo "$CFLAGS $LUA_CFLAGS $MZSCHEME_CFLAGS $PERL_CFLAGS $PYTHON_CFLAGS $PYTHON3_CFLAGS $TCL_CFLAGS $RUBY_CFLAGS $GTK_CFLAGS" | grep -q D_FILE_OFFSET_BITS 2>/dev/null; then
+  AC_MSG_RESULT(yes)
+  AC_DEFINE(_FILE_OFFSET_BITS, 64)
+else
+  AC_MSG_RESULT(no)
+fi
+
+dnl $LDFLAGS is passed to glibtool in libvterm, it doesn't like a space
+dnl between "-L" and the path that follows.
+LDFLAGS=`echo "$LDFLAGS" | sed -e 's/-L /-L/g'`
+
+dnl link.sh tries to avoid overlinking in a hackish way.
+dnl At least GNU ld supports --as-needed which provides the same functionality
+dnl at linker level. Let's use it.
+AC_MSG_CHECKING(linker --as-needed support)
+LINK_AS_NEEDED=
+# Check if linker supports --as-needed and --no-as-needed options
+if $CC -Wl,--help 2>/dev/null | grep as-needed > /dev/null; then
+  if ! echo "$LDFLAGS" | grep -q -- '-Wl,[[^[:space:]]]*--as-needed'; then
+    LDFLAGS="$LDFLAGS -Wl,--as-needed"
+  fi
+  LINK_AS_NEEDED=yes
+fi
+if test "$LINK_AS_NEEDED" = yes; then
+  AC_MSG_RESULT(yes)
+else
+  AC_MSG_RESULT(no)
+fi
+AC_SUBST(LINK_AS_NEEDED)
+
+# IBM z/OS reset CFLAGS for config.mk
+if test "$zOSUnix" = "yes"; then
+	CFLAGS="-D_ALL_SOURCE -Wc,float\(ieee\),dll"
+fi
+
+dnl write output files
+AC_CONFIG_FILES(auto/config.mk:config.mk.in)
+AC_OUTPUT
+
+dnl vim: set sw=2 tw=78 fo+=l: