1 files changed, 11 insertions, 9 deletions
diff --git a/util/libreboot-utils/lib/file.c b/util/libreboot-utils/lib/file.c
index 685cdf9a..3f15aabf 100644
--- a/util/libreboot-utils/lib/file.c
+++ b/util/libreboot-utils/lib/file.c
@@ -16,8 +16,17 @@ more correct usage example:
 long max = pathconf("/", _PC_PATH_MAX);
  */
 
-#ifndef _POSIX_C_SOURCE
-#define _POSIX_C_SOURCE 200809L
+#ifndef _XOPEN_SOURCE
+#define _XOPEN_SOURCE 700
+#endif
+
+/* for openat2: */
+#ifdef __linux__
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE 1
+#endif
+#include <linux/openat2.h>
+#include <sys/syscall.h>
 #endif
 
 #include <sys/types.h>
@@ -30,13 +39,6 @@ long max = pathconf("/", _PC_PATH_MAX);
 #include <string.h>
 #include <unistd.h>
 
-/* for openat2: */
-#ifdef __linux__
-#include <linux/openat2.h>
-#include <sys/syscall.h>
-long syscall(long number, ...);
-#endif
-
 #include "../include/common.h"
 
 /* check that a file changed