anchor.diff: -{ fetchurl, stdenv, python, cmake, vim, perl, ruby, unzip, which, fetchgit, clang }:
  +{ fetchurl, bash, stdenv, python, cmake, vim, perl, ruby, unzip, which, fetchgit, clang }:
   
   /*
   About Vim and plugins
  
positive.code:       mkdir -p $target
        cp -a ./ $target
  
        mkdir $target/build
        cd $target/build
        cmake -G "Unix Makefiles" . $target/cpp -DPYTHON_LIBRARIES:PATH=${python}/lib/libpython2.7.so -DPYTHON_INCLUDE_DIR:PATH=${python}/include/python2.7 -DUSE_CLANG_COMPLETER=ON -DUSE_SYSTEM_LIBCLANG=ON
        make -j -j''${NIX_BUILD_CORES} -l''${NIX_BUILD_CORES}}
  
        ${vimHelpTags}
        vimHelpTags $target
  
negative.code:   YouCompleteMe = stdenv.mkDerivation {
      src = fetchgit {
        url = "https://github.com/Valloric/YouCompleteMe.git";
        rev = "67288080ea7057ea3111cb4c863484e3b150e738";
        sha256 = "1a3rwdl458z1yrp50jdwp629j4al0zld21n15sad28g51m8gw5ka";
       };
  
      name = "youcompleteme-git-6728808";
      buildInputs = [ python cmake clang.clang ];
  
      configurePhase = ":";
  