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-rw-r--r--m4/man-heirloom-nroff.m433
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+# man-heirloom-nroff.m4 serial 1
+dnl MAN_PROG_HEIRLOOM_NROFF(PROGRAM-NAME)
+dnl Check whether the given nroff program is from the Heirloom Documentation
+dnl Tools. We do this by testing the .X number register; it should be
+dnl non-zero, and should change to a different value if the -mg option is
+dnl used to enable groff compatibility.
+AC_DEFUN([MAN_PROG_HEIRLOOM_NROFF],
+[AC_MSG_CHECKING([whether nroff is Heirloom nroff])
+
+AC_CACHE_VAL([man_cv_prog_heirloom_nroff],
+ [man_heirloom_ext_plain=`$1 2>/dev/null <<EOF | tr -d '\n'
+\\n(.X
+EOF
+`
+ man_heirloom_ext_mg=`$1 -mg 2>/dev/null <<EOF | tr -d '\n'
+\\n(.X
+EOF
+`
+ if test "x$man_heirloom_ext_plain" != 0 && \
+ test "x$man_heirloom_ext_mg" != 0 && \
+ test "x$man_heirloom_ext_plain" != "x$man_heirloom_extflag_mg"
+ then
+ man_cv_prog_heirloom_nroff=yes
+ else
+ man_cv_prog_heirloom_nroff=no
+ fi])
+
+if test "$man_cv_prog_heirloom_nroff" = "yes"
+then
+ AC_DEFINE([HEIRLOOM_NROFF], [1], [Define if nroff is Heirloom nroff.])
+fi
+AC_MSG_RESULT([$man_cv_prog_heirloom_nroff])
+])