anchor.diff:    options_1_2 = dontCheck super.options_1_2;
     options = dontCheck super.options;
     statistics = dontCheck super.statistics;
  -  c2hs = if pkgs.stdenv.isDarwin then dontCheck super.c2hs else super.c2hs;
  +  c2hs = super.c2hs;
   
     # The package doesn't compile with ruby 1.9, which is our default at the moment.
     hruby = super.hruby.override { ruby = pkgs.ruby_2_1; };
  
positive.code: 
    # https://github.com/ndmitchell/shake/issues/206
    # https://github.com/ndmitchell/shake/issues/267
    shake = overrideCabal super.shake (drv: { doCheck = !pkgs.stdenv.isDarwin && false; });
  
    # https://github.com/nushio3/doctest-prop/issues/1
    doctest-prop = dontCheck super.doctest-prop;
  
negative.code:   # https://github.com/yesodweb/serversession/issues/1
    serversession = dontCheck super.serversession;
  
    yesod-bin = super.yesod-bin;
  
    hmatrix = super.hmatrix;
  
    # https://github.com/commercialhaskell/stack/issues/408
    # https://github.com/commercialhaskell/stack/issues/409
  