https://src.fedoraproject.org/rpms/numad/raw/f21/f/0001-Fix-build-with-Werror-format-security.patch
https://bugs.gentoo.org/520308

From 6ab732334bc765d4b5883ddde0e9891b4813d136 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Skytt=C3=A4?= <ville.skytta@iki.fi>
Date: Mon, 20 Jan 2014 22:25:58 +0200
Subject: [PATCH 1/2] Fix build with -Werror=format-security

--- a/numad.c
+++ b/numad.c
@@ -154,7 +154,7 @@ void numad_log(int level, const char *fmt, ...) {
     }
     char buf[BUF_SIZE];
     time_t ts = time(NULL);
-    sprintf(buf, ctime(&ts));
+    sprintf(buf, "%s", ctime(&ts));
     char *p = &buf[strlen(buf) - 1];
     *p++ = ':';
     *p++ = ' ';