How to Install GCC 9 on CentOS 7 Using DevToolset and Vault Repos

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Developers running CentOS 7 can upgrade GCC to version 9 to support newer software such as Python 3.14. Since CentOS 7 mirrors are no longer active, the first step involves redirecting repository configurations to vault.centos.org using sed commands. After updating the Yum cache, GCC 9 is installed via the Software Collections (SCL) repository using the devtoolset-9 package. The toolset is then enabled with the scl enable command, which launches a new shell session with GCC 9 active. Users can confirm the installation was successful by running gcc --version in the terminal.

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