lol
1diff -ur a/aigunconstraint.c b/aigunconstraint.c
2--- a/aigunconstraint.c 2013-10-06 09:08:03.000000000 -0400
3+++ b/aigunconstraint.c 2023-10-27 08:55:01.678566389 -0400
4@@ -26,6 +26,7 @@
5 #include <stdarg.h>
6 #include <stdlib.h>
7 #include <string.h>
8+#include <unistd.h>
9
10 static const char * USAGE =
11 "usage: aigunconstraint [-h][-v] [<input> [<output>]]\n"