Enable repository and install newest gcc with following commands.
yum install centos-release-scl yum install devtoolset-9-gcc devtoolset-9-gcc-c++ devtoolset-9-binutils
Activate it and check version.
scl enable devtoolset-9 bash gcc --version
For make activation permanent add “scl enable devtoolset-9 bash” to end of the the /etc/profile file.
Ok.That’s it!