anchor.diff:  
   let
     version = "1.12";
  +
  +  inherit (stdenv.hostPlatform) system;
  +
  +  srcs = {
  +    x86_64-linux = fetchurl {
  +      url = "https://static-meteor.netdna-ssl.com/packages-bootstrap/${version}/meteor-bootstrap-os.linux.x86_64.tar.gz";
  +      sha256 = "0l3zc76djzypvc0dm5ikv5ybb6574qd6kdbbkarzc2dxx64wkyvb";
  +    };
  +    x86_64-darwin = fetchurl {
  +      url = "https://static-meteor.netdna-ssl.com/packages-bootstrap/${version}/meteor-bootstrap-os.osx.x86_64.tar.gz";
  +      sha256 = "01gn3m6qacp3ibvp0rcvm2pq7fi1xds02ws0irypldh7vz3930jl";
  +    };
  +  };
   in
   
   stdenv.mkDerivation {
     inherit version;
     pname = "meteor";
  -  src = fetchurl {
  -    url = "https://static-meteor.netdna-ssl.com/packages-bootstrap/${version}/meteor-bootstrap-os.linux.x86_64.tar.gz";
  -    sha256 = "0l3zc76djzypvc0dm5ikv5ybb6574qd6kdbbkarzc2dxx64wkyvb";
  -  };
  +  src = srcs.${system};
   
     #dontStrip = true;
   
  
positive.code:     toolsDir=$(dirname $(find $out/packages -print | grep "meteor-tool/.*/tools/index.js$"))
      ln -s $toolsDir $out/tools
  
      # Patch Meteor to dynamically fixup shebangs and ELF metadata where
      # necessary.
      pushd $out
      patch -p1 < ${./main.patch}
      popd
      substituteInPlace $out/tools/cli/main.js \
        --replace "@INTERPRETER@" "$(cat $NIX_CC/nix-support/dynamic-linker)" \
        --replace "@RPATH@" "${lib.makeLibraryPath [ stdenv.cc.cc zlib ]}" \
        --replace "@PATCHELF@" "${patchelf}/bin/patchelf"
  
      # Patch node.
      node=$devBundle/bin/node
      patchelf \
        --set-interpreter $(cat $NIX_CC/nix-support/dynamic-linker) \
        --set-rpath "$(patchelf --print-rpath $node):${stdenv.cc.cc.lib}/lib" \
        $node
  
      # Patch mongo.
      for p in $devBundle/mongodb/bin/mongo{,d}; do
        patchelf \
          --set-interpreter $(cat $NIX_CC/nix-support/dynamic-linker) \
          --set-rpath "$(patchelf --print-rpath $p):${lib.makeLibraryPath [ stdenv.cc.cc zlib ]}" \
          $p
      done
  
      # Patch node dlls.
      for p in $(find $out/packages -name '*.node'); do
        patchelf \
          --set-rpath "$(patchelf --print-rpath $p):${stdenv.cc.cc.lib}/lib" \
          $p || true
      done
  
      # Meteor needs an initial package-metadata in $HOME/.meteor,
      # otherwise it fails spectacularly.
      mkdir -p $out/bin
  
negative.code:       chmod +w "\$HOME/.meteor/package-metadata/v2.0.1/packages.data.db"
      fi
  
      $out/dev_bundle/bin/node --no-wasm-code-gc \''${TOOL_NODE_FLAGS} $out/tools/index.js "\$@"
      EOF
      chmod +x $out/bin/meteor
    '';
  
    postFixup = lib.optionalString stdenv.isLinux ''
        # Patch Meteor to dynamically fixup shebangs and ELF metadata where
        # necessary.
        pushd $out
        patch -p1 < ${./main.patch}
        popd
        substituteInPlace $out/tools/cli/main.js \
          --replace "@INTERPRETER@" "$(cat $NIX_CC/nix-support/dynamic-linker)" \
          --replace "@RPATH@" "${lib.makeLibraryPath [ stdenv.cc.cc zlib ]}" \
          --replace "@PATCHELF@" "${patchelf}/bin/patchelf"
  
        # Patch node.
        patchelf \
          --set-interpreter $(cat $NIX_CC/nix-support/dynamic-linker) \
          --set-rpath "$(patchelf --print-rpath $out/dev_bundle/bin/node):${stdenv.cc.cc.lib}/lib" \
          $out/dev_bundle/bin/node
  
        # Patch mongo.
        for p in $out/dev_bundle/mongodb/bin/mongo{,d}; do
          patchelf \
            --set-interpreter $(cat $NIX_CC/nix-support/dynamic-linker) \
            --set-rpath "$(patchelf --print-rpath $p):${lib.makeLibraryPath [ stdenv.cc.cc zlib ]}" \
            $p
        done
  
        # Patch node dlls.
        for p in $(find $out/packages -name '*.node'); do
          patchelf \
            --set-rpath "$(patchelf --print-rpath $p):${stdenv.cc.cc.lib}/lib" \
            $p || true
        done
    '';
  
    meta = with lib; {
      description = "Complete open source platform for building web and mobile apps in pure JavaScript";
      homepage = "http://www.meteor.com";
      license = licenses.mit;
      platforms = builtins.attrNames srcs;
      maintainers = with maintainers; [ cstrahan ];
    };
  }
  