{ "defaults":
  { "type": "configure"
  , "target": "defaults (unconfigured)"
  , "arguments_config": ["TOOLCHAIN_CONFIG"]
  , "config":
    { "type": "let*"
    , "bindings":
      [ [ "CC toolchain"
        , { "type": "lookup"
          , "map":
            { "type": "var"
            , "name": "TOOLCHAIN_CONFIG"
            , "default": {"type": "empty_map"}
            }
          , "key": "CC"
          , "default": {"type": "empty_map"}
          }
        ]
      , [ "CC"
        , { "type": "lookup"
          , "map": {"type": "var", "name": "CC toolchain"}
          , "key": "CC"
          , "default": "cc"
          }
        ]
      , [ "CXX"
        , { "type": "lookup"
          , "map": {"type": "var", "name": "CC toolchain"}
          , "key": "CXX"
          , "default": "c++"
          }
        ]
      , [ "PATH"
        , { "type": "lookup"
          , "map": {"type": "var", "name": "CC toolchain"}
          , "key": "PATH"
          , "default": []
          }
        ]
      ]
    , "body": {"type": "env", "vars": ["CC", "CXX", "PATH"]}
    }
  }
, "defaults (unconfigured)":
  { "type": "defaults"
  , "arguments_config": ["CC", "CXX", "PATH"]
  , "CC": [{"type": "var", "name": "CC"}]
  , "CXX": [{"type": "var", "name": "CXX"}]
  , "PATH": {"type": "var", "name": "PATH"}
  }
}