{ pkgs, haskellLib }:

with haskellLib;

self: super: {

  # Suitable LLVM version.
  llvmPackages = pkgs.llvmPackages_35;

  # Disable GHC 7.10.x core libraries.
  array = null;
  base = null;
  binary = null;
  bin-package-db = null;
  bytestring = null;
  Cabal = null;
  containers = null;
  deepseq = null;
  directory = null;
  filepath = null;
  ghc-boot = null;
  ghc-boot-th = null;
  ghc-prim = null;
  ghci = null;
  haskeline = null;
  hoopl = null;
  hpc = null;
  integer-gmp = null;
  pretty = null;
  process = null;
  rts = null;
  template-haskell = null;
  terminfo = null;
  time = null;
  transformers = null;
  unix = null;
  xhtml = null;

  # These are now core libraries in GHC 8.4.x.
  mtl = self.mtl_2_2_2;
  parsec = self.parsec_3_1_13_0;
  parsec_3_1_13_0 = addBuildDepends super.parsec_3_1_13_0 [self.fail self.semigroups];
  stm = self.stm_2_5_0_0;
  text = self.text_1_2_3_1;

  # Build jailbreak-cabal with the latest version of Cabal.
  jailbreak-cabal = super.jailbreak-cabal.override { Cabal = self.Cabal_1_24_2_0; };

  gtk2hs-buildtools = super.gtk2hs-buildtools.override { Cabal = self.buildHaskellPackages.Cabal_1_24_2_0; };

  # https://github.com/mrkkrp/megaparsec/issues/282
  megaparsec = addBuildDepend (dontCheck super.megaparsec) self.fail;

  Extra = appendPatch super.Extra (pkgs.fetchpatch {
    url = "https://github.com/seereason/sr-extra/commit/29787ad4c20c962924b823d02a7335da98143603.patch";
    sha256 = "193i1xmq6z0jalwmq0mhqk1khz6zz0i1hs6lgfd7ybd6qyaqnf5f";
  });

  # Requires ghc 8.2
  ghc-proofs = dontDistribute super.ghc-proofs;

  # haddock: No input file(s).
  nats = dontHaddock super.nats;
  bytestring-builder = dontHaddock super.bytestring-builder;

  # Setup: At least the following dependencies are missing: base <4.8
  hspec-expectations = overrideCabal super.hspec-expectations (drv: {
    postPatch = "sed -i -e 's|base < 4.8|base|' hspec-expectations.cabal";
  });
  utf8-string = overrideCabal super.utf8-string (drv: {
    postPatch = "sed -i -e 's|base >= 3 && < 4.8|base|' utf8-string.cabal";
  });

  # acid-state/safecopy#25 acid-state/safecopy#26
  safecopy = dontCheck (super.safecopy);

  # test suite broken, some instance is declared twice.
  # https://bitbucket.org/FlorianHartwig/attobencode/issue/1
  AttoBencode = dontCheck super.AttoBencode;

  # Test suite fails with some (seemingly harmless) error.
  # https://code.google.com/p/scrapyourboilerplate/issues/detail?id=24
  syb = dontCheck super.syb;

  # Test suite has stricter version bounds
  retry = dontCheck super.retry;

  # test/System/Posix/Types/OrphansSpec.hs:19:13:
  #    Not in scope: type constructor or class ‘Int32’
  base-orphans = dontCheck super.base-orphans;

  # Test suite fails with time >= 1.5
  http-date = dontCheck super.http-date;

  # Version 1.19.5 fails its test suite.
  happy = dontCheck super.happy;

  # Upstream was notified about the over-specified constraint on 'base'
  # but refused to do anything about it because he "doesn't want to
  # support a moving target". Go figure.
  barecheck = doJailbreak super.barecheck;

  # https://github.com/kazu-yamamoto/unix-time/issues/30
  unix-time = dontCheck super.unix-time;

  # diagrams/monoid-extras#19
  monoid-extras = overrideCabal super.monoid-extras (drv: {
    prePatch = "sed -i 's|4\.8|4.9|' monoid-extras.cabal";
  });

  # diagrams/statestack#5
  statestack = overrideCabal super.statestack (drv: {
    prePatch = "sed -i 's|4\.8|4.9|' statestack.cabal";
  });

  # diagrams/diagrams-core#83
  diagrams-core = overrideCabal super.diagrams-core (drv: {
    prePatch = "sed -i 's|4\.8|4.9|' diagrams-core.cabal";
  });

  timezone-olson = doJailbreak super.timezone-olson;
  xmonad-extras = overrideCabal super.xmonad-extras (drv: {
    postPatch = ''
      sed -i -e "s,<\*,<¤,g" XMonad/Actions/Volume.hs
    '';
  });

  # Workaround for a workaround, see comment for "ghcjs" flag.
  jsaddle = let jsaddle' = disableCabalFlag super.jsaddle "ghcjs";
            in addBuildDepends jsaddle' [ self.glib self.gtk3 self.webkitgtk3
                                          self.webkitgtk3-javascriptcore ];

  # https://github.com/lymar/hastache/issues/47
  hastache = dontCheck super.hastache;

  # The compat library is empty in the presence of mtl 2.2.x.
  mtl-compat = dontHaddock super.mtl-compat;

  # https://github.com/bos/bloomfilter/issues/11
  bloomfilter = dontHaddock (appendConfigureFlag super.bloomfilter "--ghc-option=-XFlexibleContexts");

  # https://github.com/ocharles/tasty-rerun/issues/5
  tasty-rerun = dontHaddock (appendConfigureFlag super.tasty-rerun "--ghc-option=-XFlexibleContexts");

  # http://hub.darcs.net/ivanm/graphviz/issue/5
  graphviz = dontCheck (appendPatch super.graphviz ./patches/graphviz-fix-ghc710.patch);

  # https://github.com/HugoDaniel/RFC3339/issues/14
  timerep = dontCheck super.timerep;

  # Required to fix version 0.91.0.0.
  wx = dontHaddock (appendConfigureFlag super.wx "--ghc-option=-XFlexibleContexts");

  # Inexplicable haddock failure
  # https://github.com/gregwebs/aeson-applicative/issues/2
  aeson-applicative = dontHaddock super.aeson-applicative;

  # GHC 7.10.1 is affected by https://github.com/srijs/hwsl2/issues/1.
  hwsl2 = dontCheck super.hwsl2;

  # https://github.com/haskell/haddock/issues/427
  haddock = dontCheck self.haddock_2_16_1;

  # haddock-api >= 2.17 is GHC 8.0 only
  haddock-api = self.haddock-api_2_16_1;
  haddock-library = self.haddock-library_1_2_1;

  # The tests in vty-ui do not build, but vty-ui itself builds.
  vty-ui = enableCabalFlag super.vty-ui "no-tests";

  # https://github.com/fpco/stackage/issues/1112
  vector-algorithms = addBuildDepends (dontCheck super.vector-algorithms) [ self.mtl self.mwc-random ];

  # vector with ghc < 8.0 needs semigroups
  vector = addBuildDepend super.vector self.semigroups;

  # too strict dependency on directory
  tasty-ant-xml = doJailbreak super.tasty-ant-xml;

  # https://github.com/thoughtpolice/hs-ed25519/issues/13
  ed25519 = dontCheck super.ed25519;

  # Breaks a dependency cycle between QuickCheck and semigroups
  hashable = dontCheck super.hashable;
  unordered-containers = dontCheck super.unordered-containers;

  # GHC versions prior to 8.x require additional build inputs.
  aeson = disableCabalFlag (addBuildDepend super.aeson self.semigroups) "old-locale";
  ansi-wl-pprint = addBuildDepend super.ansi-wl-pprint self.semigroups;
  attoparsec = addBuildDepends super.attoparsec (with self; [semigroups fail]);
  bytes = addBuildDepend super.bytes self.doctest;
  case-insensitive = addBuildDepend super.case-insensitive self.semigroups;
  cmdargs = addBuildDepend super.cmdargs self.semigroups;
  contravariant = addBuildDepend super.contravariant self.semigroups;
  dependent-map = addBuildDepend super.dependent-map self.semigroups;
  distributive = addBuildDepend (dontCheck super.distributive) self.semigroups;
  Glob = addBuildDepends super.Glob (with self; [semigroups]);
  hoauth2 = overrideCabal super.hoauth2 (drv: { testDepends = (drv.testDepends or []) ++ [ self.wai self.warp ]; });
  hslogger = addBuildDepend super.hslogger self.HUnit;
  intervals = addBuildDepends super.intervals (with self; [doctest QuickCheck]);
  lens = addBuildDepend super.lens self.generic-deriving;
  mono-traversable = addBuildDepend super.mono-traversable self.semigroups;
  natural-transformation = addBuildDepend super.natural-transformation self.semigroups;
  optparse-applicative = addBuildDepends super.optparse-applicative [self.semigroups self.fail];
  parser-combinators = addBuildDepend super.parser-combinators self.semigroups;
  QuickCheck = addBuildDepend super.QuickCheck self.semigroups;
  reflection = addBuildDepend super.reflection self.semigroups;
  semigroups = addBuildDepends (dontCheck super.semigroups) (with self; [hashable tagged text unordered-containers]);
  tar = addBuildDepend super.tar self.semigroups;
  texmath = addBuildDepend super.texmath self.network-uri;
  yesod-auth-oauth2 = overrideCabal super.yesod-auth-oauth2 (drv: { testDepends = (drv.testDepends or []) ++ [ self.load-env self.yesod ]; });

  # cereal must have `fail` in pre-ghc-8.0.x versions and tests require
  # bytestring>=0.10.8.1.
  cereal = dontCheck (addBuildDepend super.cereal self.fail);

  # The test suite requires Cabal 1.24.x or later to compile.
  comonad = dontCheck super.comonad;
  semigroupoids = dontCheck super.semigroupoids;

  # Newer versions require base >=4.9 && <5.
  colour = self.colour_2_3_3;

  # https://github.com/atzedijkstra/chr/issues/1
  chr-pretty = doJailbreak super.chr-pretty;
  chr-parse = doJailbreak super.chr-parse;

  # The autogenerated Nix expressions don't take into
  # account `if impl(ghc >= x.y)`, which is a common method to depend
  # on `semigroups` or `fail` when building with GHC < 8.0.
  system-filepath = addBuildDepend super.system-filepath self.semigroups;
  haskell-src-exts = addBuildDepend super.haskell-src-exts self.semigroups;
  free = addBuildDepend super.free self.fail;

  # Newer versions don't build without base-4.9
  resourcet = self.resourcet_1_1_11;
  conduit = self.conduit_1_2_13_1;

}