patch-elm-binaries = with pkgs.elmPackages; writeShellScriptBin "patch-elm-binaries" ''
      DIR=./node_modules/elm/Elm-Platform/*/.cabal-sandbox/bin
      rm $DIR/elm; ln -s ${elm}/bin/elm $DIR/elm
      rm $DIR/elm-make; ln -s ${elm}/bin/elm-make $DIR/elm-make
      rm $DIR/elm-package; ln -s ${elm}/bin/elm-package $DIR/elm-package
      rm $DIR/elm-reactor; ln -s ${elm}/bin/elm-reactor $DIR/elm-reactor
      rm $DIR/elm-repl; ln -s ${elm}/bin/elm-repl $DIR/elm-repl

      DIR=./node_modules/elm-test/bin
      rm $DIR/elm-interface-to-json; ln -s ${elm-interface-to-json}/bin/elm-interface-to-json $DIR/elm-interface-to-json
    '';