Install GCC

tar xvf gcc-12.2.0.tar.gz
cd gcc-12.2.0
mkdir build
cd build

unset C_INCLUDE_PATH
unset CPLUS_INCLUDE_PATH
unset LD_LIBRARY_PATH
unset LIBRARY_PATH

../configure --prefix=/ceph-fj/fangjun/software/gcc-12.2.0
make -j 5
make install

gcc_dir=/ceph-fj/fangjun/software/gcc-12.2.0
export PATH=$gcc_dir/bin:$PATH
export CC=$gcc_dir/bin/gcc
export CXX=$gcc_dir/bin/g++
export LIBRARY_PATH=$gcc_dir/lib64:$LIBRARY_PATH
export LD_LIBRARY_PATH=$gcc_dir/lib64:$LD_LIBRARY_PATH
export C_INCLUDE_PATH=$gcc_dir/include
export CPLUS_INCLUDE_PATH=$gcc_dir/include

Using conda

conda install -c conda-forge gcc==9.5.0
conda install -c conda-forge gxx==9.5.0