When performing a new installation from the CentOS 6 minimal install using the full installation procedure, a warning is displayed when the tuleap-documentation package reaches the %post target.
I think this may be related to the fact httpd is not yet installed/running at this point.
How to reproduce:
* Install CentOS 6 minimal install
* Follow tuleap full installation procedure at
http://doc-en.tuleap.net/en/latest/installation-guide/full-installation.html
Attached is a screenshot.