diff -Ppru linux-atm-2.5.2.orig/src/maint/hediag.c linux-atm-2.5.2/src/maint/hediag.c
--- linux-atm-2.5.2.orig/src/maint/hediag.c	2009-11-30 17:56:52.000000000 +0100
+++ linux-atm-2.5.2/src/maint/hediag.c	2014-01-23 23:29:56.288066939 +0100
@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 #include <sys/ioctl.h>
 #include <sys/types.h>