--- src/include/buffer.h.orig 2016-04-28 18:46:27.769231116 +0200
+++ src/include/buffer.h 2016-04-28 18:47:36.872928731 +0200
@@ -22,6 +22,8 @@
# define _XOPEN_SOURCE 600
#endif
+#include <sys/cdefs.h>
+
#include <stdio.h>
#include <sys/uio.h>