diff --git a/include/sys/stat.h b/include/sys/stat.h
index 0cb770bb..8513a3c9 100644
--- a/include/sys/stat.h
+++ b/include/sys/stat.h
@@ -23,7 +23,15 @@
 #if __GNUC__ && POSIX
 #undef __MES_SYS_STAT_H
 #include_next <sys/stat.h>
-#endif // (__GNUC__ && POSIX)
+
+#else // !(__GNUC__ && POSIX)
+
+#ifndef __MES_MODE_T
+#define __MES_MODE_T
+typedef int mode_t;
+#endif
+
+int chmod (char const *file_name, mode_t mode);
 
 struct stat {
   int st_dev;
@@ -41,5 +49,7 @@ struct stat {
   int st_ctime;
 };
 
+#endif // !(__GNUC__ && POSIX)
+
 #endif // __MES_SYS_STAT_H