Define OS_LINUX only if it's not defined yet

ee9d4877 · Shinichiro Hamaji · c4814b72 · ee9d4877
Commit ee9d4877 authored May 09, 2017 by Shinichiro Hamaji
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utilities.h src/utilities.h +3 -1

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--- a/src/utilities.h
+++ b/src/utilities.h
@@ -39,7 +39,9 @@
 #elif defined(__CYGWIN__) || defined(__CYGWIN32__)
 # define OS_CYGWIN
 #elif defined(linux) || defined(__linux) || defined(__linux__)
-# define OS_LINUX
+# ifndef OS_LINUX
+#  define OS_LINUX
+# endif
 #elif defined(macintosh) || defined(__APPLE__) || defined(__APPLE_CC__)
 # define OS_MACOSX
 #elif defined(__FreeBSD__)