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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 1d7d2b8a82..aaf89f9664 100644
--- a/include/ruby/missing.h
+++ b/include/ruby/missing.h
@@ -18,6 +18,8 @@ extern "C" {
#endif
#endif
+#define __STDC_WANT_LIB_EXT1__ 1
+
#include "ruby/config.h"
#include <stddef.h>
#include <math.h> /* for INFINITY and NAN */