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-rw-r--r--include/my_context.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/my_context.h b/include/my_context.h
index ea0e3496887..45d2a7d7ffa 100644
--- a/include/my_context.h
+++ b/include/my_context.h
@@ -52,6 +52,9 @@ struct my_context {
#ifdef MY_CONTEXT_USE_UCONTEXT
+#if defined(__APPLE__) && !defined(_XOPEN_SOURCE)
+#define _XOPEN_SOURCE
+#endif
#include <ucontext.h>
struct my_context {