AC_REQUIRE: include FAQ URL when warning about duplicate expansion

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2011-07-11  Mike Frysinger  <vapier@gentoo.org>

	* lib/m4sugar/m4sugar.m4 (_m4_require_check): Add URL to warning.

diff --git a/lib/m4sugar/m4sugar.m4 b/lib/m4sugar/m4sugar.m4
index 00f1f4a91a53466ae8c3d96633d2dd1121c872d8..ac012e7e91d94a10279baf66d78bf0861e68a881 100644 (file)
--- a/lib/m4sugar/m4sugar.m4
+++ b/lib/m4sugar/m4sugar.m4
@@ -2100,7 +2100,8 @@ m4_provide_if([$1], [m4_set_remove([_m4_provide], [$1])],
 m4_define([_m4_require_check],
 [m4_if(_m4_defn([_m4_diverting]), [$2], [m4_ignore],
        m4_ifdef([_m4_diverting([$2])], [-]), [-], [m4_warn([syntax],
-   [$3: `$1' was expanded before it was required])_m4_require_call],
+   [$3: `$1' was expanded before it was required
+http://www.gnu.org/software/autoconf/manual/autoconf.html#Expanded-Before-Required])_m4_require_call],
        [m4_ignore])])