Mention "software collections"

[TheDcoder]

Hi,

I was trying to compile something and found that the system version of GCC is severely outdated because it comes from the Cent OS 7 repository.

What I didn't know and wasn't mentioned in the manual is that Uberspace already had "software collections" installed along with several collections:

$ scl --list
devtoolset-7
devtoolset-9
llvm-toolset-7
php74
php81
php82
php83

The devtoolset-9 collection had a new enough version of GCC which let me compile my code, but I was not aware of its existence until I did my own research and found software collections.

It would be of immense help if it was mentioned in the manual, perhaps in the page for GCC.