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-rw-r--r--mrbgems/mruby-bin-mirb/tools/mirb/mirb.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mrbgems/mruby-bin-mirb/tools/mirb/mirb.c b/mrbgems/mruby-bin-mirb/tools/mirb/mirb.c
index 8cc756174..a4780a415 100644
--- a/mrbgems/mruby-bin-mirb/tools/mirb/mirb.c
+++ b/mrbgems/mruby-bin-mirb/tools/mirb/mirb.c
@@ -63,7 +63,7 @@
#define MIRB_USING_HISTORY()
#endif
-#ifndef _WIN32
+#if !defined(_WIN32) && defined(_POSIX_C_SOURCE)
#define MIRB_SIGSETJMP(env) sigsetjmp(env, 1)
#define MIRB_SIGLONGJMP(env, val) siglongjmp(env, val)
#define SIGJMP_BUF sigjmp_buf