[CentOS] Trying to find gcc 5

Fri Dec 4 00:26:56 UTC 2020
mark <m.roth at 5-cent.us>

Hi, folks,

    It seems I can't run a version of calibre newer than 3.23 without at 
least one library from gcc-5 (and the calibre attitude seems to be 
"screw you, 4's ancient, move to another distro").

    I've added the scl repo - what devtoolset do I need to install?