... that has already defined the NOT_REACHED macro

Add an #ifndef guard around NOT_REACHED macro.
---
 lib/util.h |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/util.h b/lib/util.h
index 462247b..1680cd6 100644
--- a/lib/util.h
+++ b/lib/util.h
@@ -150,7 +150,9 @@ is_pow2(uintmax_t x)
 #define MAX(X, Y) ((X) > (Y) ? (X) : (Y))
 #endif
 
+#ifndef NOT_REACHED
 #define NOT_REACHED() abort()
+#endif
 
 /* Expands to a string that looks like "<file>:<line>", e.g. "tmp.c:10".
  *
-- 
1.7.9.5

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