diff --git a/pkgs/development/compilers/ghc/8.4.1.nix b/pkgs/development/compilers/ghc/8.4.1.nix
new file mode 100644
index 000000000000..b5db328a8a2c
--- /dev/null
+++ b/pkgs/development/compilers/ghc/8.4.1.nix
@@ -0,0 +1,129 @@
+{ stdenv, targetPackages
+, buildPlatform, hostPlatform, targetPlatform
+, selfPkgs, cross ? null
+
+# build-tools
+, bootPkgs, alex, happy
+, autoconf, automake, coreutils, fetchgit, perl, python3
+
+, libiconv ? null, ncurses
+
+, # If enabled, GHC will be built with the GPL-free but slower integer-simple
+  # library instead of the faster but GPLed integer-gmp library.
+  enableIntegerSimple ? false, gmp ? null
+
+, version ? "8.4.20180115"
+}:
+
+assert !enableIntegerSimple -> gmp != null;
+
+let
+  inherit (bootPkgs) ghc;
+
+  rev = "3e3a096885c0fcd0703edbeffb4e47f5cbd8f4cc";
+
+  # TODO(@Ericson2314) Make unconditional
+  targetPrefix = stdenv.lib.optionalString
+    (targetPlatform != hostPlatform)
+    "${targetPlatform.config}-";
+in
+stdenv.mkDerivation (rec {
+  inherit version rev;
+  name = "${targetPrefix}ghc-${version}";
+
+  src = fetchgit {
+    url = "git://git.haskell.org/ghc.git";
+    inherit rev;
+    sha256 = "06slymbsd7vsfp4hh40v7cxf7nmp0kvlni2wfq7ag5wlqh04slgs";
+  };
+
+  postPatch = "patchShebangs .";
+
+  preConfigure = ''
+    echo ${version} >VERSION
+    echo ${rev} >GIT_COMMIT_ID
+    ./boot
+    sed -i -e 's|-isysroot /Developer/SDKs/MacOSX10.5.sdk||' configure
+  '' + stdenv.lib.optionalString (!stdenv.isDarwin) ''
+    export NIX_LDFLAGS="$NIX_LDFLAGS -rpath $out/lib/ghc-${version}"
+  '' + stdenv.lib.optionalString stdenv.isDarwin ''
+    export NIX_LDFLAGS+=" -no_dtrace_dof"
+  '' + stdenv.lib.optionalString enableIntegerSimple ''
+    echo "INTEGER_LIBRARY=integer-simple" > mk/build.mk
+  '' + stdenv.lib.optionalString (targetPlatform != hostPlatform) ''
+    sed 's|#BuildFlavour  = quick-cross|BuildFlavour  = perf-cross|' mk/build.mk.sample > mk/build.mk
+  '';
+
+  buildInputs = [ ghc perl autoconf automake happy alex python3 ];
+
+  enableParallelBuilding = true;
+
+  configureFlags = [
+    "CC=${stdenv.cc}/bin/cc"
+    "--with-curses-includes=${ncurses.dev}/include" "--with-curses-libraries=${ncurses.out}/lib"
+    "--datadir=$doc/share/doc/ghc"
+  ] ++ stdenv.lib.optional (! enableIntegerSimple) [
+    "--with-gmp-includes=${gmp.dev}/include" "--with-gmp-libraries=${gmp.out}/lib"
+  ] ++ stdenv.lib.optional stdenv.isDarwin [
+    "--with-iconv-includes=${libiconv}/include" "--with-iconv-libraries=${libiconv}/lib"
+  ];
+
+  # required, because otherwise all symbols from HSffi.o are stripped, and
+  # that in turn causes GHCi to abort
+  stripDebugFlags = [ "-S" ] ++ stdenv.lib.optional (!targetPlatform.isDarwin) "--keep-file-symbols";
+
+  checkTarget = "test";
+
+  postInstall = ''
+    paxmark m $out/lib/${name}/bin/${if targetPlatform != hostPlatform then "ghc" else "{ghc,haddock}"}
+
+    # Install the bash completion file.
+    install -D -m 444 utils/completion/ghc.bash $out/share/bash-completion/completions/${targetPrefix}ghc
+
+    # Patch scripts to include "readelf" and "cat" in $PATH.
+    for i in "$out/bin/"*; do
+      test ! -h $i || continue
+      egrep --quiet '^#!' <(head -n 1 $i) || continue
+      sed -i -e '2i export PATH="$PATH:${stdenv.lib.makeBinPath [ targetPackages.stdenv.cc.bintools coreutils ]}"' $i
+    done
+  '';
+
+  outputs = [ "out" "doc" ];
+
+  passthru = {
+    inherit bootPkgs targetPrefix;
+  } // stdenv.lib.optionalAttrs (targetPlatform != buildPlatform) {
+    crossCompiler = selfPkgs.ghc.override {
+      cross = targetPlatform;
+      bootPkgs = selfPkgs;
+    };
+  };
+
+  meta = {
+    homepage = http://haskell.org/ghc;
+    description = "The Glasgow Haskell Compiler";
+    maintainers = with stdenv.lib.maintainers; [ marcweber andres peti ];
+    inherit (ghc.meta) license platforms;
+  };
+
+} // stdenv.lib.optionalAttrs (cross != null) {
+  configureFlags = [
+    "CC=${stdenv.cc}/bin/${cross.config}-cc"
+    "LD=${stdenv.cc.bintools}/bin/${cross.config}-ld"
+    "AR=${stdenv.cc.bintools}/bin/${cross.config}-ar"
+    "NM=${stdenv.cc.bintools}/bin/${cross.config}-nm"
+    "RANLIB=${stdenv.cc.bintools}/bin/${cross.config}-ranlib"
+    "--target=${cross.config}"
+    "--enable-bootstrap-with-devel-snapshot"
+  ] ++
+    # fix for iOS: https://www.reddit.com/r/haskell/comments/4ttdz1/building_an_osxi386_to_iosarm64_cross_compiler/d5qvd67/
+    stdenv.lib.optional (cross.config or null == "aarch64-apple-darwin14") "--disable-large-address-space";
+
+  configurePlatforms = [];
+
+  passthru = {
+    inherit bootPkgs cross;
+    cc = "${stdenv.cc}/bin/${cross.config}-cc";
+    ld = "${stdenv.cc}/bin/${cross.config}-ld";
+  };
+})
diff --git a/pkgs/development/haskell-modules/configuration-ghc-8.4.x.nix b/pkgs/development/haskell-modules/configuration-ghc-8.4.x.nix
new file mode 100644
index 000000000000..03e42463fee6
--- /dev/null
+++ b/pkgs/development/haskell-modules/configuration-ghc-8.4.x.nix
@@ -0,0 +1,44 @@
+{ pkgs, haskellLib }:
+
+with haskellLib;
+
+self: super: {
+
+  # Use the latest LLVM.
+  inherit (pkgs) llvmPackages;
+
+  # Disable GHC 8.4.x core libraries.
+  #
+  # Verify against:
+  # ls /nix/store/wnh3kxra586h9wvxrn62g4lmsri2akds-ghc-8.4.20180115/lib/ghc-8.4.20180115/ -1 | sort | grep -e '-' | grep -Ev '(txt|h|targets)$'
+  array = null;
+  base = null;
+  binary = null;
+  bytestring = null;
+  Cabal = null;
+  containers = null;
+  deepseq = null;
+  directory = null;
+  filepath = null;
+  bin-package-db = null;
+  ghc-boot = null;
+  ghc-boot-th = null;
+  ghc-compact = null;
+  ghci = null;
+  ghc-prim = null;
+  haskeline = null;
+  hpc = null;
+  integer-gmp = null;
+  mtl = null;
+  parsec = null;
+  pretty = null;
+  process = null;
+  stm = null;
+  template-haskell = null;
+  terminfo = null;
+  text = null;
+  time = null;
+  transformers = null;
+  unix = null;
+  xhtml = null;
+}
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index cba1f9a54a24..0ecb52097798 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -78,6 +78,12 @@ in rec {
       sphinx = pkgs.python3Packages.sphinx;
       selfPkgs = packages.ghc822;
     };
+    ghc841 = callPackage ../development/compilers/ghc/8.4.1.nix rec {
+      bootPkgs = packages.ghc821Binary;
+      inherit (bootPkgs) alex happy;
+      inherit buildPlatform targetPlatform;
+      selfPkgs = packages.ghc841;
+    };
     ghcHEAD = callPackage ../development/compilers/ghc/head.nix rec {
       bootPkgs = packages.ghc821Binary;
       inherit (bootPkgs) alex happy;
@@ -136,6 +142,10 @@ in rec {
       ghc = compiler.ghc821Binary;
       compilerConfig = callPackage ../development/haskell-modules/configuration-ghc-8.2.x.nix { };
     };
+    ghc841 = callPackage ../development/haskell-modules {
+      ghc = compiler.ghc841;
+      compilerConfig = callPackage ../development/haskell-modules/configuration-ghc-8.4.x.nix { };
+    };
     ghcHEAD = callPackage ../development/haskell-modules {
       ghc = compiler.ghcHEAD;
       compilerConfig = callPackage ../development/haskell-modules/configuration-ghc-head.nix { };