File sshguard-gcc5.patch of Package sshguard

Index: sshguard-2.4.3/src/blocker/sshguard_whitelist.c
===================================================================
--- sshguard-2.4.3.orig/src/blocker/sshguard_whitelist.c
+++ sshguard-2.4.3/src/blocker/sshguard_whitelist.c
@@ -18,6 +18,7 @@
  * SSHGuard. See http://www.sshguard.net
  */
 
+#define _GNU_SOURCE
 #include <arpa/inet.h>
 #include <assert.h>
 #include <netdb.h>