% cat /etc/redhat-release Scientific Linux release 6.4 (Carbon)
The default compiler coming with SL6 was installed.
% gcc --version gcc (GCC) 4.8.2 20140120 (Red Hat 4.8.2-15)
Our gcc compiler was backward and forward compatible with gcc 4.4.6 by using the devtoolset (repackaged).
Other revisions are in /opt/gcc at BNL and this location is supported by the STAR login's 'setup' script. Note that an alternative to set another compiler location is supported via an environment variable named USE_GCC_DIR. See documentation Setting up your computing environment for more information.
The secondary compiler choice is gcc 4.6.3 and we also supported 4.4.7 for an even smoother support.
The AFS canonical sysname for SL6 is x8664_sl6.
The final list of RPMs is attached to this post as a text file for historical purposes (as well as helping setting up new systems).