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-rw-r--r--lib/birdlib.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/birdlib.h b/lib/birdlib.h
index 1904d66..faf8bc6 100644
--- a/lib/birdlib.h
+++ b/lib/birdlib.h
@@ -13,7 +13,9 @@
#define OFFSETOF(s, i) ((unsigned int)&((s *)0)->i)
#define SKIP_BACK(s, i, p) ((s *)((char *)p - OFFSETOF(s, i)))
+#ifndef ALIGN
#define ALIGN(s, a) (((s)+a-1)&~(a-1))
+#endif
/* Utility macros */