gitolite - smart-http - gives uninitialised value

I'm getting the following error in my /var/log/apache2/error.log when I try to do a git clone to my server running gitolite with smart-http enabled

[Wed Jul 25 21:53:36 2012] [error] [client 124.149.104.106] FATAL: warn\tUse of 
uninitialized value $rc{"UMASK"} in umask at /opt/git/gitolite-source/src/
gitolite-shell line 95, <DATA> line 1.<<newline>>

I do have the UMASK value set to 0027 in /home/git/.gitolite.rc

Any thoughts why the value isn't setting when called from an su_exec from a file in sites-available?

I'm running apache as www-data - and have set up permissions on the various scripts as per the instructions here - ie:

install -d -m 0755 -o git -g git /var/www/bin
install -d -m 0755 -o www -g www /var/www/git

and then:

create a shell script inside /var/www/bin named gitolite-suexec-wrapper.sh, with mode 0700 and owned by user and group git.

Ok got it - basically I reinstalled starting from scratch:

Install gitolite (installing the source to the /home/git directory and running the setup as the git user using su - git)
Read the warning here
Run the steps in this document (ie not run the file - just line by line)
Don't run the exports here as we'll run gitolite as the git user
Install gitweb using apt-get - configure it to point to the repositories at /home/git/repositories

Put the following into the apache site configuration here /etc/apache2/sites-available/git.servername.com

<VirtualHost *:80>
    ServerAdmin mail@servername.com
    ServerAlias git
    ServerName git.servername.com

    DocumentRoot /var/www/git

    <Directory /var/www/git>
      Options +Indexes
      AllowOverride none
      Order allow,deny
      Allow from all
    </Directory>

    SuexecUserGroup git git
    ScriptAlias /git/ /var/www/bin/gitolite-suexec-wrapper.sh/
    ScriptAlias /gitmob/ /var/www/bin/gitolite-suexec-wrapper.sh/

    <Location /git>
      AuthType Basic
      AuthName "Git Access"
      Require valid-user
      AuthUserFile /home/git/gitolite-http-authuserfile
    </Location>
    Loglevel warn
    ErrorLog /var/log/apache2/error.log
    CustomLog /var/log/apache2/access.log combined
</VirtualHost>

Use the styles for gitweb from here.
Now I can access my site via ssh using git clone ssh://git@git.servername.com:gitolite-admin.git http://admin@git.servername.com/git/testing.git

and view it at http://servername.com/gitweb