--- nix/machine.c.orig	1995-01-12 00:53:00.000000000 -0600
+++ nix/machine.c	2020-11-18 14:05:34.000000000 -0600
@@ -22,6 +22,7 @@
 #include <stdlib.h>
 #include <ctype.h>
 #include <stdio.h>
+#include <string.h>
 #include <sys/types.h>
 #include <utime.h>
 #include <time.h>