diff --git a/include/unistd.h b/include/unistd.h
index 6279a78..793af31 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -46,9 +46,21 @@
 
 #include <unistd_ilp.h>
 
+#define _POSIX2_C_BIND 200809L
+
+#define _XOPEN_ENH_I18N 700
+#define _XOPEN_SHM 700
+
 #define R_OK 01
 #define W_OK 02
 #define X_OK 04
-#define F_OK 08
+#define F_OK 010
+
+#define _CS_PATH "/bin:/sbin:/usr/bin:/usr/sbin"
+
+#define F_LOCK 01
+#define F_TEST 02
+#define F_TLOCK 03
+#define F_ULOCK 04
 
 #endif