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-rw-r--r--libc-symbols.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/libc-symbols.h b/libc-symbols.h
index f7231f9c7c..7405e67086 100644
--- a/libc-symbols.h
+++ b/libc-symbols.h
@@ -46,6 +46,9 @@ Cambridge, MA 02139, USA.  */
    itself is being compiled, or just some generator program.  */
 #define _LIBC	1
 
+/* Enable declarations of GNU extensions, since we are compiling them.  */
+#define _GNU_SOURCE	1
+
 #include <config.h>
 
 /* This disables sccsid/rcsid strings in lots of code of non-GNU origin.  */