It's been a while since I reported a problem with the patch here and no 
further comment has been made. I guess the majority of users out there are 
probably using one of the pre-packaged versions of vim 7.3 and so this 
problem hasn't come down the pipeline to hit them yet. I have seen one other 
reference to the problem whilst browsing the web: 
http://crumbtrail.chesmart.in/

I still don't think the original patch was the right solution here, but 
until someone comes up with a better solution, I wonder if the the following 
patch could be applied?

--- a/ftplugin/man.vim 2011-07-22 19:55:14.000000000 +0100
+++ b/ftplugin/man.vim 2011-07-24 17:55:49.000000000 +0100
@@ -17,7 +17,9 @@
 
   " Ensure Vim is not recursively invoked (man-db does this)
   " when doing ctrl-[ on a man page reference.
-  let $MANPAGER = ""
+  if exists("$MANPAGER")
+    let $MANPAGER = ""
+  endif
 
   " allow dot and dash in manual page name.
   setlocal iskeyword+=\.,-

This patch maintains the fix for the original problem, but limits the 
potential side effects to those that have a MANPAGER environment variable 
actually defined.  

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