volume_id: fail on undefined __BYTE_ORDER

diff --git a/extras/volume_id/lib/md5.c b/extras/volume_id/lib/md5.c
index 08606600666dad3b94eec753c66f30f83f22df09..9c4b28464457e8b56ee974021baef64034039593 100644 (file)
--- a/extras/volume_id/lib/md5.c
+++ b/extras/volume_id/lib/md5.c
@@ -20,7 +20,7 @@
 
 #include "md5.h"
 
-#if !(__BYTE_ORDER == __LITTLE_ENDIAN) && !(__BYTE_ORDER == __BIG_ENDIAN)
+#if !defined __BYTE_ORDER || !(__BYTE_ORDER == __LITTLE_ENDIAN) && !(__BYTE_ORDER == __BIG_ENDIAN)
 #error missing __BYTE_ORDER
 #endif