Missing dependency for c++ compiler

[Gnonthgol]

Nice job on the spec file. Works nice on rhel7 derivatives when following the instructions. However if you use a fresh minimal OS installation it often does not include a c++ compiler and you end up with errors during the configuration phase of the build. Manually installing gcc-c++ fixes this issue. However it should be added as a build dependency.

[wendall911]

Thanks for letting me know. I think I knew about this, then forgot. I'll make sure when I update I add this. If you can do a PR, that works as well.