anchor.diff:    };
   
     cmakeFlags = [
  -    "-DMSGPACK_INCLUDE_DIRS=${msgpack}/include"
  -    "-DMSGPACK_LIBRARIES=${msgpack}/lib/msgpackc.so"
  +    "-DUSE_SYSTEM_MSGPACK=1"
     ];
   
     buildInputs = with pythonPackages; [
  
positive.code: 
    doCheck = true;
  
    postInstall = ''
      wrapProgram "$out/bin/nvim-qt" \
        --prefix PATH : "${neovim}/bin"
    '';
  
negative.code:   enableParallelBuilding = true;
  
    preConfigure = ''
      # we rip out a number of tests that fail in the build env
      # the GUI tests will never work but the others should - they did before neovim 0.2.0
      # was released
      sed -i test/CMakeLists.txt \
        -e '/^add_xtest_gui/d' \
        -e '/tst_neovimobject/d' \
        -e '/tst_neovimconnector/d' \
        -e '/tst_callallmethods/d' \
        -e '/tst_encoding/d'
  