If you don't have useful support on your HPC system, I'd expect GCC would be the least of your problems, but it's clearly a local problem. However, as far as I

If you don't have useful support on your HPC system, I'd expect GCC would be the least of your problems, but it's clearly a local problem. However, as far as I remember, you can unpack the devtoolset rpms somewhere (rpm2cpio), point the relevant environment variables at the result, and use it.