anchor.diff:    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;
   
  
positive.code:   # Upstream notified by e-mail.
    permutation = dontCheck super.permutation;
  
    # https://github.com/vincenthz/hs-tls/issues/102
    tls = dontCheck super.tls;
  
    # https://github.com/jputcu/serialport/issues/25
    serialport = dontCheck super.serialport;
  
  
negative.code: 
    # Fails no apparent reason. Upstream has been notified by e-mail.
    assertions = dontCheck super.assertions;
  
    # These packages try to execute non-existent external programs.
    cmaes = dontCheck super.cmaes;                        # http://hydra.cryp.to/build/498725/log/raw
  