anchor.diff:    tz = overrideCabal super.tz (drv: { preConfigure = "export TZDIR=${pkgs.tzdata}/share/zoneinfo"; });
   
     # Deprecated upstream and doesn't compile.
  +  BASIC = dontDistribute super.BASIC;
  +  bytestring-arbitrary = dontDistribute (addBuildTool super.bytestring-arbitrary self.llvm);
  +  llvm = dontDistribute super.llvm;
     llvm-base = markBroken super.llvm-base;
  -  bytestring-arbitrary = dontDistribute (addBuildTool super.bytestring-arbitrary self.llvm);
  +  llvm-base-util = dontDistribute super.llvm-base-util;
  +  llvm-extra = dontDistribute super.llvm-extra;
  +  llvm-tf = dontDistribute super.llvm-tf;
     objectid = dontDistribute super.objectid;
     saltine-quickcheck = dontDistribute super.saltine-quickcheck;
  +  stable-tree = dontDistribute super.stable-tree;
  +  synthesizer-llvm = dontDistribute super.synthesizer-llvm;
  +  optimal-blocks = dontDistribute super.optimal-blocks;
   
     # https://ghc.haskell.org/trac/ghc/ticket/9625
     vty = dontCheck super.vty;
  
positive.code:   haroonga-httpd = markBroken super.haroonga-httpd;
  
    # Cannot find pkg-config data for "webkit-1.0".
    webkit = markBroken super.webkit;
    websnap = markBroken super.websnap;
  
    # Build is broken and no contact info available.
    hopenpgp-tools = markBroken super.hopenpgp-tools;
  
negative.code:   # Build fails, but there seems to be no issue tracker available. :-(
    hmidi = markBrokenVersion "0.2.1.0" super.hmidi;
    padKONTROL = markBroken super.padKONTROL;
    Bang = dontDistribute super.Bang;
    launchpad-control = dontDistribute super.launchpad-control;
  
    # Upstream provides no issue tracker and no contact details.
    vivid = markBroken super.vivid;
  