anchor.diff:  
     # https://github.com/bos/math-functions/issues/25
     math-functions = dontCheck super.math-functions;
  -
  -  # http-api-data_0.3.x requires QuickCheck > 2.9, but overriding that version
  -  # is hard because of transitive dependencies, so we just disable tests.
  -  http-api-data_0_3_5 = dontCheck super.http-api-data_0_3_5;
   
     # Fix build for latest versions of servant and servant-client.
     servant_0_10 = super.servant_0_10.overrideScope (self: super: {
  
positive.code:   # https://github.com/josefs/STMonadTrans/issues/4
    STMonadTrans = dontCheck super.STMonadTrans;
  
    socket_0_7_0_0 = super.socket_0_7_0_0.overrideScope (self: super: { QuickCheck = self.QuickCheck_2_9_2; });
  
    # requires most recent vty
    brick = super.brick.overrideScope (self: super: { vty = self.vty_5_15; });
  
    turtle_1_3_1 = super.turtle_1_3_1.overrideScope (self: super: {
      optparse-applicative = self.optparse-applicative_0_13_0_0;
    });
  
    # No upstream issue tracker
    hspec-expectations-pretty-diff = dontCheck super.hspec-expectations-pretty-diff;
  
    lentil = super.lentil.overrideScope (self: super: {
      pipes = self.pipes_4_3_2;
      optparse-applicative = self.optparse-applicative_0_13_0_0;
      # https://github.com/roelvandijk/terminal-progress-bar/issues/14
      terminal-progress-bar = doJailbreak self.terminal-progress-bar_0_1_1;
    });
  
negative.code:   # https://github.com/plow-technologies/servant-auth/issues/20
    servant-auth = dontCheck super.servant-auth;
  
    # https://github.com/pontarius/pontarius-xmpp/issues/105
    pontarius-xmpp = dontCheck super.pontarius-xmpp;
  
    # https://github.com/bmillwood/applicative-quoters/issues/6
    applicative-quoters = doJailbreak super.applicative-quoters;
  