Re: [Trisquel-users] How to install GCC 6.3 on trisquel 7

[dooleyn]

Perhaps consider installing the Guix package manager. With it you can  
currently install any (or all) of gcc 4.7.4, 4.8.5, 4.9.4, 5.4.0, 6.3.0 (see  
link below) so it would be possible to use the gcc specifically required by  
your program. The Guix packages are based on a rolling release model so they  
should always have the latest version available for the packages they  
currently provide. Their list of packages is still small compared to those  
available in the Trisquel repositories but it is growing all the time. The  
other advantage is you can be confident they only provide free software  
packages and is a much better option that some random ppa. I've recently done  
a fresh install of Trisquel 7 and have been using Guix almost exclusively as  
my package manager. For anything it doesn't have I can always fall back to  
the Trisquel repositories.

https://www.gnu.org/software/guix/packages/g.html