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-rw-r--r--include/ruby/missing.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/ruby/missing.h b/include/ruby/missing.h
index aaf89f9664..8db33496ab 100644
--- a/include/ruby/missing.h
+++ b/include/ruby/missing.h
@@ -18,7 +18,9 @@ extern "C" {
#endif
#endif
+#ifndef __STDC_WANT_LIB_EXT1__
#define __STDC_WANT_LIB_EXT1__ 1
+#endif
#include "ruby/config.h"
#include <stddef.h>