anchor.diff:        ensureDir "$out/share/emacs"
         mv $pname-$version emacs/site-lisp
       '';
  -  doCheck = false;
     meta = {
       homepage = "http://www.mew.org/~kazu/proj/ghc-mod/";
       description = "Happy Haskell programming on Emacs/Vim";
  
positive.code: 
  cabal.mkDerivation (self: {
    pname = "ghc-mod";
    version = "1.12.4";
    sha256 = "1f4pdwimzc2i7bb7ccpbl8pn18ygnqd65xw1z5cmhlswasbdab14";
    isLibrary = false;
    isExecutable = true;
    buildDepends = [
  
negative.code:     ioChoice syb time transformers
    ];
    buildTools = [ emacs ];
    doCheck = false;
    postInstall = ''
        cd $out/share/$pname-$version
        make
  