Install build essentials.

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sudo dnf groupinstall "Development Tools"  # gcc-11 is installed by default

Enable devel repository and install gcc toolset 13:

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sudo dnf config-manager --set-enabled devel
sudo dnf update
sudo dnf install gcc-toolset-13

To enable gcc-13:

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scl enable gcc-toolset-13 bash

To disable gcc-13, just exit the shell:

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exit