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--- src/macros.h.orig 2009-04-14 11:21:18.000000000 +0900
+++ src/macros.h 2009-05-10 02:55:54.000000000 +0900
@@ -34,7 +34,7 @@
// References of interest:
// <http://sourcefrog.net/weblog/software/languages/C/unused.html>
#ifndef UNUSED_
-# ifdef __GNUC__
+# if (defined(__GNUC__) && __GNUC__ > 3)
# define UNUSED_ __attribute__((unused))
# define DEPRECATED_ __attribute__((deprecated))
# // MSVC (_MSC_VER) doesn't seem to have an unused attribute (__declspec(...))
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