Allow definition of key_t elsewhere.

diff --git a/posix/sys/types.h b/posix/sys/types.h
index 2aec0f698df29b76c5767c9fdd78b1ff20e13981..ac2738b0cecdd770c5943687dd26e610f1a837bd 100644 (file)
--- a/posix/sys/types.h
+++ b/posix/sys/types.h
@@ -111,8 +111,9 @@ typedef __daddr_t daddr_t;
 typedef __caddr_t caddr_t;
 #endif
 
-#if defined __USE_SVID || defined __USE_XOPEN
+#if (defined __USE_SVID || defined __USE_XOPEN) && !defined key_t
 typedef __key_t key_t;
+# define key_t key_t
 #endif
 
 #ifdef __USE_XOPEN