--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,15 @@
 2012-03-10  Paul Eggert  <eggert@cs.ucla.edu>
 
+	regex: allow inclusion of <regex.h> before <limits.h>
+	Without this patch, portable programs had to include <limits.h> before
+	<regex.h> if they wanted a consistent value for RE_DUP_MAX.
+	I ran into this problem with a test version of GNU grep on Solaris 8.
+	* lib/regex.h: Include <limits.h> if _REGEX_INCLUDE_LIMITS_H.
+	This is done conditionally so that this change can be merged
+	back to glibc.
+	* m4/regex.m4 (gl_REGEX): Define _REGEX_INCLUDE_LIMITS_H if
+	using the included regex.
+
 	fts: depend on fdopendir
 	* modules/fts (Depends-on): Depend on fdopendir.  This is needed
 	on Solaris 8, at least, since it lacks fdopendir.  Evidently the

--- a/lib/regex.h
+++ b/lib/regex.h
@@ -294,6 +294,9 @@
 /* Maximum number of duplicates an interval can allow.  POSIX-conforming
    systems might define this in <limits.h>, but we want our
    value, so remove any previous define.  */
+# ifdef _REGEX_INCLUDE_LIMITS_H
+#  include <limits.h>
+# endif
 # ifdef RE_DUP_MAX
 #  undef RE_DUP_MAX
 # endif

--- a/m4/regex.m4
+++ b/m4/regex.m4
@@ -1,4 +1,4 @@
-# serial 60
+# serial 61
 
 # Copyright (C) 1996-2001, 2003-2012 Free Software Foundation, Inc.
 #
@@ -175,6 +175,9 @@
   esac
 
   if test $ac_use_included_regex = yes; then
+    AC_DEFINE([_REGEX_INCLUDE_LIMITS_H], [1],
+      [Define if you want <regex.h> to include <limits.h>, so that it
+       consistently overrides <limits.h>'s RE_DUP_MAX.])
     AC_DEFINE([_REGEX_LARGE_OFFSETS], [1],
       [Define if you want regoff_t to be at least as wide POSIX requires.])
     AC_DEFINE([re_syntax_options], [rpl_re_syntax_options],