Favor GCC 4.6 if it exists...  During the PyDAWv4 development cycle,
I've been fighting with numerous compiler bugs, and even Valgrind is
struggling against the binaries GCC 4.8 has been creating.

I tried GCC 4.8.2 in Fedora 19 and I believe many/most/all of the issues
may be fixed, so hopefully this kludge can go away at Ubuntu 14.04