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diff --git a/aigunconstraint.c b/aigunconstraint.c
--- a/aigunconstraint.c
+++ b/aigunconstraint.c
@@ -26,6 +26,7 @@ IN THE SOFTWARE.
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
+#include <unistd.h>
static const char * USAGE =
"usage: aigunconstraint [-h][-v] [<input> [<output>]]\n"
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