packages:
  externaltool:
    buildable: False
    paths:
      externaltool@1.0%gcc@4.5.0: /path/to/external_tool
      externaltool@0.9%gcc@4.5.0: /usr
  externalvirtual:
    buildable: False
    paths:
      externalvirtual@2.0%clang@3.3: /path/to/external_virtual_clang
      externalvirtual@1.0%gcc@4.5.0: /path/to/external_virtual_gcc
  externalmodule:
    buildable: False
    modules:
      externalmodule@1.0%gcc@4.5.0: external-module
