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-rw-r--r--include/u.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/u.h b/include/u.h
index b7319ae5..df82ac59 100644
--- a/include/u.h
+++ b/include/u.h
@@ -6,6 +6,7 @@ extern "C" {
#define __BSD_VISIBLE 1 /* FreeBSD 5.x */
#define __EXTENSIONS__ 1 /* SunOS */
+#define __MAKECONTEXT_V2_SOURCE 1 /* SunOS */
#define _BSD_SOURCE 1
#define _SVID_SOURCE 1
#define _XOPEN_SOURCE 1000