anchor.diff:    test-sandbox = dontCheck super.test-sandbox;
     users-postgresql-simple = dontCheck super.users-postgresql-simple;
     wai-middleware-hmac = dontCheck super.wai-middleware-hmac;
  -  wai-middleware-throttle = dontCheck super.wai-middleware-throttle; # https://github.com/creichert/wai-middleware-throttle/issues/1
     xkbcommon = dontCheck super.xkbcommon;
     xmlgen = dontCheck super.xmlgen;
     hapistrano = dontCheck super.hapistrano;
  
positive.code: 
    # 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
  
negative.code:   # Upstream notified by e-mail.
    permutation = dontCheck super.permutation;
  
    # https://github.com/jputcu/serialport/issues/25
    serialport = dontCheck super.serialport;
  
  