mkdir mpas_src
cd mpas_src
git clone --depth 1 --branch v6.3 https://github.com/MPAS-Dev/MPAS-Model.git MPAS-Model_v6.3_egeon.spack_v0.18.1_oneapi
cd MPAS-Model_v6.3_egeon.spack_v0.18.1_oneapi
git switch -c branch_v6.3