How to create a toolbox in Fedora 38 Silverblue with a downgraded gcc (gcc 12 instead of gcc 13)?

Looking at the information for the gcc package, it appears that F37 is still using gcc 12.X.

So the easiest method would be to create a F37 toolbox and install gcc there.

toolbox create -r 37
toolbox enter fedora-toolbox-37

If you need a F38 toolbox for some reason, you can try downloading a 12.X build from koji and installing that way. Though in my brief experiments, I ran into a dependency hell that would be difficult to solve manually.

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