From 2a6f486464c3461b7fb0959fa39ce572a90007cf Mon Sep 17 00:00:00 2001
From: Jim Meyering <jim@meyering.net>
Date: Sat, 4 Jul 1998 00:17:52 +0000
Subject: [PATCH] *** empty log message ***

---
 m4/regex.m4 | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/m4/regex.m4 b/m4/regex.m4
index 2a7bfe014..733ad3a4e 100644
--- a/m4/regex.m4
+++ b/m4/regex.m4
@@ -9,6 +9,23 @@ AC_DEFUN(jm_WITH_REGEX,
 		USE_REGEX=$withval,
 		USE_REGEX=yes)
 
-    test "$USE_REGEX" = "yes" && LIBOBJS="$LIBOBJS regex.o"
+    if test "$USE_REGEX" = yes; then
+
+      LIBOBJS="$LIBOBJS regex.o"
+
+    else
+      if test x = y; then
+	# This code is deliberately never run via ./configure.
+	# FIXME: this is a hack to make autoheader put the corresponding
+	# HAVE_* undef for this symbol in config.h.in.  This saves me the
+	# trouble of having to maintain the #undef in acconfig.h manually.
+	AC_CHECK_FUNCS(LIBC_REGEX)
+      fi
+      # Defining it this way (rather than via AC_DEFINE) short-circuits the
+      # autoheader check -- autoheader doesn't know it's already been taken
+      # care of by the hack above.
+      ac_kludge=HAVE_LIBC_REGEX
+      AC_DEFINE_UNQUOTED($ac_kludge)
+    fi
   ]
 )
-- 
2.11.0