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-rw-r--r--lib/birdlib.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/birdlib.h b/lib/birdlib.h
index fc27db9..1904d66 100644
--- a/lib/birdlib.h
+++ b/lib/birdlib.h
@@ -19,6 +19,7 @@
#define MIN(a,b) (((a)<(b))?(a):(b))
#define MAX(a,b) (((a)>(b))?(a):(b))
+#define ABS(a) ((a)>=0 ? (a) : -(a))
#define ARRAY_SIZE(a) (sizeof(a)/sizeof(*(a)))
#ifndef NULL