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-rw-r--r--argp/argp-help.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/argp/argp-help.c b/argp/argp-help.c
index 246096943f..baa54c91d6 100644
--- a/argp/argp-help.c
+++ b/argp/argp-help.c
@@ -18,6 +18,10 @@
    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.  */
 
+#ifndef _GNU_SOURCE
+# define _GNU_SOURCE	1
+#endif
+
 #ifdef HAVE_CONFIG_H
 #include <config.h>
 #endif