anchor.diff:    };
   
     tmuxNavigator = buildVimPlugin {
  -    name = "vim-tmux-navigator-git-3de98bfc";
  +    name = "tmux-navigator-git-3de98bfc";
       src = fetchgit {
         url = "https://github.com/christoomey/vim-tmux-navigator.git";
         rev = "3de98bfcee1289ce8edc6daf9a18f243180c7168";
  
positive.code:   };
  
    vundle = buildVimPlugin {
      name = "vundle-vim-git-0b28e334";
      src = fetchgit {
        url = "https://github.com/gmarik/Vundle.vim.git";
        rev = "0b28e334e65b6628b0a61c412fcb45204a2f2bab";
  
negative.code: 
    alternate = stdenv.mkDerivation rec {
      version = "2.18";
      name    = "alternate-${version}";
  
      src = fetchurl {
        url    = "http://www.vim.org/scripts/download_script.php?src_id=7218";
  