[Halld-offline] gcc 4.9

[Curtis A. Meyer]

This looks like gcc 4.9 is available as part of the devtoolset-3 packages as
rpms for RHEL6 … The latter link has pretty simple instructions for both 
RHEL6 and CENTOS6

https://rhn.redhat.com/errata/RHBA-2015-2026.html

https://www.softwarecollections.org/en/scls/rhscl/devtoolset-3/

---------
Curtis A. Meyer			MCS Associate Dean for Faculty and Graduate Affairs
Wean:    (412) 268-2745	Professor of Physics
Doherty: (412) 268-3090	Carnegie Mellon University
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