1 files changed, 5 insertions, 1 deletions
diff --git a/common/compat.h b/common/compat.h
index 86a9e04..bd6078a 100644
--- a/common/compat.h
+++ b/common/compat.h
@@ -20,6 +20,8 @@
 #ifndef _COMPAT_H_
 #define _COMPAT_H_
 
+#define _GNU_SOURCE
+
 /* Force use of win32 configuration if compiling there */
 #ifdef _WIN32
 #include "../config.win32.h"
@@ -156,7 +158,9 @@ extern int optind, opterr, optopt;
 int getopt(int nargc, char* const* nargv, const char* ostr);
 #endif
 
-#ifndef HAVE_ERR_H
+#ifdef HAVE_ERR_H
+#include <err.h>
+#else
 #include <stdarg.h>
 void err_set_file(void *fp);
 void err_set_exit(void (*ef)(int));