--- a/usr_sbin/ccstools.h
+++ b/usr_sbin/ccstools.h
@@ -23,7 +23,7 @@
 #define _FILE_OFFSET_BITS 64
 #define _LARGEFILE_SOURCE
 #define _LARGEFILE64_SOURCE
-#define _GNU_SOURCE
+
 #include <arpa/inet.h>
 #include <asm/types.h>
 #include <dirent.h>