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-rw-r--r--src/tsort.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/tsort.c b/src/tsort.c
index be0be95d3..1052ffbbc 100644
--- a/src/tsort.c
+++ b/src/tsort.c
@@ -26,6 +26,7 @@
#include <stdio.h>
#include <assert.h>
#include <getopt.h>
+#include <sys/types.h>
#include "system.h"
#include "closeout.h"