--- ./ngs.c	2021-12-10 05:42:18.000000000 -0500
+++ ./ngs.c	2021-12-10 05:42:32.000000000 -0500
@@ -6,6 +6,7 @@
 #include <assert.h>
 #include <errno.h>
 #include <unistd.h>
+#include <string.h>
 #include <pcre.h>
 #include "ngs.h"
 #include "syntax.include"