anchor.diff:  
     # Fails no apparent reason. Upstream has been notified by e-mail.
     assertions = dontCheck super.assertions;
  -
  -  # https://github.com/vincenthz/tasty-kat/issues/1
  -  tasty-kat = dontCheck super.tasty-kat;
   
     # These packages try to execute non-existent external programs.
     cmaes = dontCheck super.cmaes;                        # http://hydra.cryp.to/build/498725/log/raw
  
positive.code:   webkitgtk3-javascriptcore = super.webkitgtk3-javascriptcore.override { webkit = pkgs.webkitgtk24x; };
    websnap = super.websnap.override { webkit = pkgs.webkitgtk24x; };
  
    # While waiting for https://github.com/jwiegley/gitlib/pull/53 to be merged
    hlibgit2 = addBuildTool super.hlibgit2 pkgs.git;
  
    # https://github.com/mvoidex/hsdev/issues/11
    hsdev = dontHaddock super.hsdev;
  
  
negative.code:   test-sandbox = dontCheck super.test-sandbox;
    users-postgresql-simple = dontCheck super.users-postgresql-simple;
    wai-middleware-hmac = dontCheck super.wai-middleware-hmac;
    xkbcommon = dontCheck super.xkbcommon;
    xmlgen = dontCheck super.xmlgen;
    hapistrano = dontCheck super.hapistrano;
  