spack:
  concretizer:
    unify: true
  repos:
  - $SPACK_USER_PREFIX/repo
  modules:
    default:
      tcl:
        projections:
          all: '{name}/{version}-{compiler.name}'
          cray-mpich: '{name}/{version}'
        hash_length: 0
  packages:
    cray-mpich:
      externals:
      - spec: cray-mpich@8.1.27
        modules:
        - cray-mpich/8.1.27