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-rw-r--r--xwayland/selection/selection.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/xwayland/selection/selection.c b/xwayland/selection/selection.c
index e16ad111..d9de5643 100644
--- a/xwayland/selection/selection.c
+++ b/xwayland/selection/selection.c
@@ -1,4 +1,4 @@
-#define _XOPEN_SOURCE 700
+#define _POSIX_C_SOURCE 200809L
#include <assert.h>
#include <fcntl.h>
#include <stdlib.h>