diff -Nuar ipv6toolkit-v1.4.orig/tools/scan6.c ipv6toolkit-v1.4/tools/scan6.c
--- ipv6toolkit-v1.4.orig/tools/scan6.c	2013-08-24 10:38:02.557531033 -0700
+++ ipv6toolkit-v1.4/tools/scan6.c	2013-08-24 11:32:21.244173537 -0700
@@ -62,6 +62,9 @@
 #include "scan6.h"
 #include "ipv6toolkit.h"
 #include <netinet/tcp.h>
+#ifndef OUI_DATABASE // keep this the same as the Makefiles
+#define OUI_DATABASE "/usr/share/ipv6toolkit/oui.txt"
+#endif
 
 /* Function prototypes */
 int					init_iface_data(struct iface_data *);
@@ -6027,7 +6030,7 @@
 	fclose(fp);
 
 	if(!fname_f)
-		strncpy(fname, "/usr/share/ipv6toolkit/oui.txt", MAX_FILENAME_SIZE-1);
+		strncpy(fname, OUI_DATABASE, MAX_FILENAME_SIZE-1);
 
 	return(1);
 }