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-rw-r--r--backend/wayland/output.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/backend/wayland/output.c b/backend/wayland/output.c
index 2d3e3269..b8760793 100644
--- a/backend/wayland/output.c
+++ b/backend/wayland/output.c
@@ -1,3 +1,4 @@
+#define _POSIX_C_SOURCE 199309L
#include <assert.h>
#include <stdint.h>
#include <stdio.h>