diff -ur a/src/fatcat.cpp b/src/fatcat.cpp
--- a/src/fatcat.cpp	2020-04-05 11:12:55.773602065 -0500
+++ b/src/fatcat.cpp	2020-04-05 11:13:14.112132604 -0500
@@ -8,6 +8,7 @@
 #include "xgetopt/xgetopt.h"
 #else
 #include <argp.h>
+#include <getopt.h>
 #endif
 #endif