Description: Don't use __USE_GNU
 __USE_GNU is a glibc-internal symbol.
 AC_USE_SYSTEM_EXTENSIONS is the proper autoconf
 way to enable extensions.
Author: Adrian Bunk <bunk@debian.org>

--- a/configure.ac
+++ b/configure.ac
@@ -6,6 +6,7 @@
     AM_INIT_AUTOMAKE([tar-ustar subdir-objects])
 
     AC_LANG([C])
+    AC_USE_SYSTEM_EXTENSIONS
     LT_INIT
     PKG_PROG_PKG_CONFIG
 
--- a/src/suricata-common.h
+++ b/src/suricata-common.h
@@ -35,12 +35,6 @@
 #define DBG_PERF
 #endif
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-
-#define __USE_GNU
-
 #if defined(__clang_analyzer__)
 /* clang analyzer acts as DEBUG_VALIDATION in some places, so
  * force this so #ifdef DEBUG_VALIDATION code gets included */