From d0242e117f1efc7848da85ca90516fc48e39250b Mon Sep 17 00:00:00 2001
From: jeremyclement <jclement@baker11.dwarf.local>
Date: Fri, 15 Nov 2013 16:08:30 +0100
Subject: [PATCH] test presence of persistent_undo module before use it.
 (prevent error msg for versions<703)

---
 vimrc | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/vimrc b/vimrc
index 489daa4..196cf7c 100644
--- a/vimrc
+++ b/vimrc
@@ -49,10 +49,11 @@ set nowb
 " ================ Persistent Undo ==================
 " Keep undo history across sessions, by storing in file.
 " Only works all the time.
-
-silent !mkdir ~/.vim/backups > /dev/null 2>&1
-set undodir=~/.vim/backups
-set undofile
+if has('persistent_undo')
+  silent !mkdir ~/.vim/backups > /dev/null 2>&1
+  set undodir=~/.vim/backups
+  set undofile
+endif
 
 " ================ Indentation ======================