--- configure
+++ configure
@@ -5003,7 +5003,7 @@
 
 if test "$GCC" = "yes"; then
 	# We are using the GNU C compiler. Good!
-	CFLAGS="$CFLAGS -pipe -W -Wall -Wpointer-arith -Wstrict-prototypes"
+	CFLAGS="$CFLAGS -D_GNU_SOURCE -pipe -W -Wall -Wpointer-arith -Wstrict-prototypes"
 
 
 	ssp_cc=yes