X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fregex.m4;h=2a638d6af915f746298965332181ae06e3effbc2;hb=533821b74095d336942aa4f817bdd9618c88da3e;hp=e5468c655b642f762fa1c6865d42456f02cd9288;hpb=ea12910c63ebacc2db5efa43e368b2bbed40a4d3;p=gnulib.git

diff --git a/m4/regex.m4 b/m4/regex.m4
index e5468c655..2a638d6af 100644
--- a/m4/regex.m4
+++ b/m4/regex.m4
@@ -1,19 +1,26 @@
-#serial 2
+#serial 3
 
 dnl Derived from code in GNU grep.
 
 AC_DEFUN(jm_WITH_REGEX,
   [
+    AC_REQUIRE([AM_GLIBC])
+
     dnl Even packages that don't use regex.c can use this macro.
     dnl Of course, for them it doesn't do anything.
 
     syscmd([test -f lib/regex.c])
     ifelse(sysval, 0,
       [
+	# By default, don't use the included regex.c on systems with glibc 2
+	test "$ac_cv_glibc" = yes && default=no || default=yes
+
 	AC_ARG_WITH(included-regex,
-	    [  --without-included-regex don't compile regex (use with caution)],
+	[  --without-included-regex don't compile regex; this is the default on
+                          systems with version 2 of the GNU C library
+                          (use with caution on other system)],
 		    jm_with_regex=$withval,
-		    jm_with_regex=yes)
+		    jm_with_regex=$default)
 	if test "$jm_with_regex" = yes; then
 	  LIBOBJS="$LIBOBJS regex.o"
 	fi