---- sudo-1.8.6/plugins/sudoers/env.c 2011-01-24 21:39:13.000000000 +0200
-+++ sudo-1.8.6/plugins/sudoers/env.c 2011-03-06 11:00:00.580457486 +0200
-@@ -196,12 +196,15 @@
+diff -dur -x '*~' -x '*.orig' -x '*.rej' sudo-1.8.13.orig/plugins/sudoers/env.c sudo-1.8.13/plugins/sudoers/env.c
+--- sudo-1.8.13.orig/plugins/sudoers/env.c 2015-03-18 18:05:51.000000000 +0100
++++ sudo-1.8.13/plugins/sudoers/env.c 2015-03-25 09:47:10.000000000 +0100
+@@ -197,12 +197,15 @@
static const char *initial_keepenv_table[] = {
"COLORS",
"DISPLAY",
"PS1",
"PS2",
+ "SSH_AUTH_SOCK",
- "TZ",
"XAUTHORITY",
"XAUTHORIZATION",
+ NULL