anchor.diff:        HOME=$home_old
       '';
          
  -
  -  mkFrontend =
  -    { name
  -    , version
  -    , src
  -    , src_elm_common
  -    , src_path ? "src/${name}"
  -    , node_modules
  -    , elm_packages
  -    , patchPhase ? ""
  -    , postInstall ? null
  -    }:
  -    let
  -      self = stdenv.mkDerivation {
  -        name = "${name}-${version}";
  -        src = builtins.filterSource
  -          (path: type: baseNameOf path != "elm-stuff"
  -                    && baseNameOf path != "node_modules"
  -                    )
  -          src;
  -        buildInputs = [ elmPackages.elm ] ++ (builtins.attrValues node_modules);
  -        patchPhase = ''
  -          for item in ./*; do
  -            if [ -h $item ]; then
  -              rm -f $item
  -              cp ${src_elm_common}/`basename $item` ./
  -            fi
  -          done
  -          if [ -d src ]; then
  -            for item in ./src/*; do
  -              if [ -h $item ]; then
  -                rm -f $item
  -                cp ${src_elm_common}/`basename $item` ./src/
  -              fi
  -            done
  -          fi
  -        '' + patchPhase;
  -        configurePhase = ''
  -          rm -rf node_modules
  -          rm -rf elm-stuff
  -        '' + (makeElmStuff elm_packages) + ''
  -          mkdir node_modules
  -          for item in ${builtins.concatStringsSep " " (builtins.attrValues node_modules)}; do
  -            ln -s $item/lib/node_modules/* ./node_modules
  -          done
  -        '';
  -        buildPhase = ''
  -          neo build --config webpack.config.js
  -        '';
  -        installPhase = ''
  -          mkdir $out
  -          cp build/* $out/ -R
  -          runHook postInstall
  -        '';
  -        inherit postInstall;
  -        shellHook = ''
  -          cd ${src_path}
  -        '' + self.configurePhase;
  -
  -        passthru.taskclusterGithubTasks =
  -          map (branch: mkTaskclusterGithubTask { inherit name src_path branch; })
  -            [ "master" "staging" "production" ];
  -        passthru.update = writeScript "update-${name}" ''
  -          export SSL_CERT_FILE="${cacert}/etc/ssl/certs/ca-bundle.crt"
  -          pushd ${src_path} >> /dev/null
  -          ${node2nix}/bin/node2nix \
  -            --composition node-modules.nix \
  -            --input node-modules.json \
  -            --output node-modules-generated.nix \
  -            --node-env node-env.nix \
  -            --flatten \
  -            --pkg-name nodejs-6_x
  -          rm -rf elm-stuff
  -          ${elmPackages.elm}/bin/elm-package install -y
  -          ${elm2nix}/bin/elm2nix elm-packages.nix
  -          popd
  -        '';
  -      };
  -    in self;
  -
     filterSource = src:
       { name ? null
       , include ? [ "/" ]
  
positive.code:           else false
          ) src;
  
    mkBackend =
      { name
      , version
  
negative.code:           find $out -type d -name "__pycache__" -exec 'rm -r "{}"' \;
            find $out -type d -name "*.py" -exec '${python.__old.python.executable} -m compileall -f "{}"' \;
          '';
  
          doCheck = true;
  
          checkPhase = ''
            export LANG=en_US.UTF-8
  