(_ALL_SOURCE): Don't redefine if already defined.

diff --git a/src/config.in b/src/config.in
index 5683e3e9849f46357fe471a2d0d71bc58229c220..95c9993a75fea0874022497ddc95d0c725d1511d 100644 (file)
--- a/src/config.in
+++ b/src/config.in
@@ -90,7 +90,9 @@ and this notice must be preserved on all copies.  */
 
 /* Some things figured out by the configure script, grouped as they are in
    configure.in.  */
+#ifndef _ALL_SOURCE  /* suppress warning if this is pre-defined */
 #undef _ALL_SOURCE
+#endif
 #undef HAVE_SYS_TIMEB_H
 #undef HAVE_SYS_TIME_H
 #undef HAVE_UNISTD_H