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-rw-r--r--src/cmd/rio/menu.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/cmd/rio/menu.c b/src/cmd/rio/menu.c
index 379291cc..dc23f1c3 100644
--- a/src/cmd/rio/menu.c
+++ b/src/cmd/rio/menu.c
@@ -4,6 +4,7 @@
/* Copyright (c) 1994-1996 David Hogan, see README for licence details */
#define _SVID_SOURCE 1 /* putenv in glibc */
+#define _DEFAULT_SOURCE 1
#include <stdio.h>
#include <signal.h>
#include <unistd.h>