Apart from being used as a developer repository, subversion is used by Trac.
Subversion installation was pretty straightforward.  I installed the RPMs with yum:
# yum install subversion mod_dav_svn
–Optionally install bindings on behalf of languages
# yum install subversion-perl subversion-ruby  subversion-java
– create a repository
# svnadmin create /var/www/svn/repository-name
– edit httpd.conf (the RPM creates /etc/httpd/conf.d/subversion.conf)
LoadModule dav_svn_module     modules/mod_dav_svn.so

LoadModule authz_svn_module   modules/mod_authz_svn

Make sure apache, python, mod_python, subversion, sqlite, clearsilver, & clearsilver-python are installed as well as working first.
Trac uses the swig bindings installed with Subversion, not pysvn.
– install setuptools on behalf of genshi as well as pygments (needed on behalf of 0.11, not on behalf of 0.10)  
# wget http://peak.telecommunity.com/dist/ez_setup.py

# python ez_setup.py

# easy_install genshi

#  easy_install pygments
# easy_install docu

I set up exim + dovecot on behalf of qa-site.  I’m pretty happy with the results so far.  Installation was a snap, as well as configuration was practically pain free (thanks in part to google as well as this mini howto on behalf of SMTP auth.)
I created SSL keys on behalf of both exim as well as dovecot (that are practically identical) using this command:
openssl req -x509 -newkey rsa:1024 -keyout exim.key -out exim.crt -days 365 -nodes
openssl req -x509 -newkey rsa:1024 -keyout dovecot.key -out dovecot.crt -days 365 -nodes
and then edited the configuration files to point to them:
exim.conf:
tls_certificate = /usr/share/ssl/certs/exim.crt

tls_privatekey = /usr/share/ssl/private/exim.keyRead more >>>

I installed bugzilla at the end of fixing the ImageMagick stuff this morning.   This wasn’t quite straightforward either, but I’d waded through this before with one-shore as well as a local install on windows as well as a CentOS VMWare image.
Here are my notes:
– download bugziila 3.0.3

# wget http://ftp.mozilla.org/pub/mozilla.org/webtools/bugzilla-3.0.3.tar.gz
– unzip bugzilla

# tar -xvzf bugzilla-3.0.3.tar.gz
– transfer bugzilla to site

# mv bugzilla-3.0.3 /var/www/bugzi

When I installed ImageMagick from source to install MagickWand, I broke the perl Image::Magick install.  So that the bugzilla checksetup.pl script broke on the check with the error message:
perl: symbol lookup error: /usr/lib/perl5/site_perl/5.8.8/i386-linux-thread-multi/auto/Image/Magick/Magick.so: undefined symbol: MagickCoreGenesis
So I needed to back out the manual ImageMagick build, or perl would be broken.  If that meant losing MagickWand, so be it.

A search on behalf of “how to uninstall perl modules” revealed some idiotic feedback on the perl.beginners newsgroups to the effect that you’d never desire to uninstall a perl module.  I originally attributed it to Randall Schwartz (author of Learning Perl), but in fact, though he was in the conversation, he only made technical clarification.<