anchor.diff:  
     # https://github.com/anton-k/csound-expression-dynamic/issues/1
     csound-expression-dynamic = dontHaddock super.csound-expression-dynamic;
  -
  -  # Packages of the diagrams ecosystem that require:
  -  #   diagrams-core ==1.4.*
  -  #   diagrams-lib ==1.4.*
  -  #   optparse-applicative ==0.13.*
  -  diagrams_1_4 = super.diagrams_1_4.overrideScope (self: super: {
  -    diagrams-contrib = self.diagrams-contrib_1_4_0_1;
  -    diagrams-core = self.diagrams-core_1_4;
  -    diagrams-lib = self.diagrams-lib_1_4_0_1;
  -    diagrams-svg = self.diagrams-svg_1_4_1;
  -    optparse-applicative = self.optparse-applicative_0_13_0_0;
  -  });
  -  diagrams-contrib_1_4_0_1 = super.diagrams-contrib_1_4_0_1.overrideScope (self: super: {
  -    diagrams-core = self.diagrams-core_1_4;
  -    diagrams-lib = self.diagrams-lib_1_4_0_1;
  -  });
  -  diagrams-lib_1_4_0_1 = super.diagrams-lib_1_4_0_1.overrideScope (self: super: {
  -    diagrams-core = self.diagrams-core_1_4;
  -    optparse-applicative = self.optparse-applicative_0_13_0_0;
  -  });
  -  diagrams-pgf = super.diagrams-pgf.overrideScope (self: super: {
  -    diagrams-core = self.diagrams-core_1_4;
  -    diagrams-lib = self.diagrams-lib_1_4_0_1;
  -    optparse-applicative = self.optparse-applicative_0_13_0_0;
  -  });
  -  diagrams-rasterific_1_4 = super.diagrams-rasterific_1_4.overrideScope (self: super: {
  -    diagrams-core = self.diagrams-core_1_4;
  -    diagrams-lib = self.diagrams-lib_1_4_0_1;
  -    optparse-applicative = self.optparse-applicative_0_13_0_0;
  -  });
  -  diagrams-svg_1_4_1 = super.diagrams-svg_1_4_1.overrideScope (self: super: {
  -    diagrams-core = self.diagrams-core_1_4;
  -    diagrams-lib = self.diagrams-lib_1_4_0_1;
  -    optparse-applicative = self.optparse-applicative_0_13_0_0;
  -  });
   
     # Test suite won't compile against tasty-hunit 0.9.x.
     zlib = dontCheck super.zlib;
  
positive.code:   # https://github.com/plow-technologies/servant-auth/issues/20
    servant-auth = dontCheck super.servant-auth;
  
    servant-auth-server = super.servant-auth-server.overrideScope (self: super: {
      jose = super.jose_0_5_0_2;
    });
  
    # https://github.com/pontarius/pontarius-xmpp/issues/105
    pontarius-xmpp = dontCheck super.pontarius-xmpp;
  
    # Use proper store-core version.
    store_0_3 = super.store_0_3.overrideScope (self: super: { store-core = self.store-core_0_3; });
  
    # https://github.com/bmillwood/applicative-quoters/issues/6
    applicative-quoters = doJailbreak super.applicative-quoters;
  
negative.code:     preConfigure = "sed -i -e 's,time .* < 1.6,time >= 1.5,' -e 's,haddock-library >= 1.1 && < 1.3,haddock-library >= 1.1,' pandoc.cabal";
    });
  
    # https://github.com/tych0/xcffib/issues/37
    xcffib = dontCheck super.xcffib;
  
  