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-rw-r--r--sway/commands/exec_always.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/sway/commands/exec_always.c b/sway/commands/exec_always.c
index 1d7cd494..ab2d8622 100644
--- a/sway/commands/exec_always.c
+++ b/sway/commands/exec_always.c
@@ -1,3 +1,4 @@
+#define _XOPEN_SOURCE 500
#include <string.h>
#include <sys/wait.h>
#include <unistd.h>