On 02/07/2017 02:33 PM, Alice Wonder wrote: > That's what I am trying to avoid, and that is easiest to avoid by just > using /usr as the prefix so that devel files have their headers in > /usr/include and devel files for different implementations of the same > API can not be installed at the same time. None of that is particularly relevant. There are only 3 "devel" packages in the devtoolset-4 collection, and those are only for the developer tools. Using that collection for gcc, especially if you're only using that compiler for one package, isn't going to create the conflicts you're describing.