add _DEFAULT_SOURCE for glibc >= 2.20

configure.ac

@@ -47,7 +47,8 @@ AH_TOP([
 #define __NEXTEPC_CONFIG_H__
 /* need this, because some autoconf tests rely on this (e.g. stpcpy)
  * and it should be used for new programs  */
-#define _GNU_SOURCE  1
+#define _DEFAULT_SOURCE 1
+#define _GNU_SOURCE  	1
 ])
 
 AH_BOTTOM([

lib/s1ap/asn1c/asn_system.h

@@ -13,11 +13,9 @@
 #include "config.h"
 #endif
 
-#if 0 /* modified by acetcom */
 #ifndef _BSD_SOURCE
 #define _BSD_SOURCE /* for snprintf() on some linux systems  */
 #endif
-#endif
 
 #include <stdio.h>	/* For snprintf(3) */
 #include <stdlib.h>	/* For *alloc(3) */