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-rw-r--r--client/pool-buffer.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/client/pool-buffer.c b/client/pool-buffer.c
index 6555a3ae..588bd06c 100644
--- a/client/pool-buffer.c
+++ b/client/pool-buffer.c
@@ -1,4 +1,4 @@
-#define _XOPEN_SOURCE 600
+#define _POSIX_C_SOURCE 200809
#include <assert.h>
#include <cairo/cairo.h>
#include <fcntl.h>