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+# ===========================================================================
+# http://www.gnu.org/software/autoconf-archive/ax_lib_readline.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# AX_LIB_READLINE_LLDPD
+#
+# DESCRIPTION
+#
+# Searches for a readline compatible library. If found, defines
+# `HAVE_LIBREADLINE'. If the found library has the `add_history' function,
+# sets also `HAVE_READLINE_HISTORY'. Also checks for the locations of the
+# necessary include files and sets `HAVE_READLINE_H' or
+# `HAVE_READLINE_READLINE_H' and `HAVE_READLINE_HISTORY_H' or
+# 'HAVE_HISTORY_H' if the corresponding include files exists.
+#
+# The libraries that may be readline compatible are `libedit',
+# `libeditline' and `libreadline'. Sometimes we need to link a termcap
+# library for readline to work, this macro tests these cases too by trying
+# to link with `libtermcap', `libcurses' or `libncurses' before giving up.
+#
+# Here is an example of how to use the information provided by this macro
+# to perform the necessary includes or declarations in a C file:
+#
+# #ifdef HAVE_LIBREADLINE
+# # if defined(HAVE_READLINE_READLINE_H)
+# # include <readline/readline.h>
+# # elif defined(HAVE_READLINE_H)
+# # include <readline.h>
+# # else /* !defined(HAVE_READLINE_H) */
+# extern char *readline ();
+# extern int rl_insert_text(const char*);
+# extern void rl_forced_update_display(void);
+# extern int rl_bind_key(int, int(*f)(int, int));
+# # endif /* !defined(HAVE_READLINE_H) */
+# char *cmdline = NULL;
+# #else /* !defined(HAVE_READLINE_READLINE_H) */
+# /* no readline */
+# #endif /* HAVE_LIBREADLINE */
+#
+# #ifdef HAVE_READLINE_HISTORY
+# # if defined(HAVE_READLINE_HISTORY_H)
+# # include <readline/history.h>
+# # elif defined(HAVE_HISTORY_H)
+# # include <history.h>
+# # else /* !defined(HAVE_HISTORY_H) */
+# extern void add_history ();
+# extern int write_history ();
+# extern int read_history ();
+# # endif /* defined(HAVE_READLINE_HISTORY_H) */
+# /* no history */
+# #endif /* HAVE_READLINE_HISTORY */
+#
+# LICENSE
+#
+# Copyright (c) 2008 Ville Laurikari <vl@iki.fi>
+#
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice
+# and this notice are preserved. This file is offered as-is, without any
+# warranty.
+
+# Modified version. Original version is available here:
+# http://www.gnu.org/software/autoconf-archive/ax_lib_readline.html
+
+#serial 6
+
+AU_ALIAS([VL_LIB_READLINE], [AX_LIB_READLINE_LLDPD])
+AC_DEFUN([AX_LIB_READLINE_LLDPD], [
+ AC_CACHE_CHECK([for a readline compatible library],
+ ax_cv_lib_readline, [
+ _save_LIBS="$LIBS"
+ for readline_lib in readline edit editline; do
+ for termcap_lib in "" termcap curses ncurses; do
+ if test -z "$termcap_lib"; then
+ TRY_LIB="-l$readline_lib"
+ else
+ TRY_LIB="-l$readline_lib -l$termcap_lib"
+ fi
+ LIBS="$ORIG_LIBS $TRY_LIB"
+ for readline_func in readline rl_insert_text rl_forced_update_display; do
+ AC_TRY_LINK_FUNC($readline_func, ax_cv_lib_readline="$TRY_LIB", ax_cv_lib_readline="")
+ if test -z "$ax_cv_lib_readline"; then
+ break
+ fi
+ done
+ if test -n "$ax_cv_lib_readline"; then
+ break
+ fi
+ done
+ if test -n "$ax_cv_lib_readline"; then
+ break
+ fi
+ done
+ if test -z "$ax_cv_lib_readline"; then
+ ax_cv_lib_readline="no"
+ fi
+ LIBS="$_save_LIBS"
+ ])
+
+ if test "$ax_cv_lib_readline" != "no"; then
+ READLINE_LIBS="$ax_cv_lib_readline"
+ AC_SUBST(READLINE_LIBS)
+
+ _save_LIBS="$LIBS"
+ LIBS="$LIBS $READLINE_LIBS"
+ AC_DEFINE(HAVE_LIBREADLINE, 1,
+ [Define if you have a readline compatible library])
+ AC_CHECK_HEADERS(readline.h readline/readline.h)
+ AC_CACHE_CHECK([whether readline supports history],
+ ax_cv_lib_readline_history, [
+ ax_cv_lib_readline_history="no"
+ AC_TRY_LINK_FUNC(add_history, ax_cv_lib_readline_history="yes")
+ ])
+ if test "$ax_cv_lib_readline_history" = "yes"; then
+ AC_DEFINE(HAVE_READLINE_HISTORY, 1,
+ [Define if your readline library has \`add_history'])
+ AC_CHECK_HEADERS(history.h readline/history.h)
+ fi
+
+ LIBS="$_save_LIBS"
+ fi
+])dnl