diff --git a/pkgs/development/compilers/ghcjs/head.nix b/pkgs/development/compilers/ghcjs/head.nix
new file mode 100644
index 000000000000..2bf13cb895f5
--- /dev/null
+++ b/pkgs/development/compilers/ghcjs/head.nix
@@ -0,0 +1,178 @@
+{ mkDerivation
+, test-framework
+, test-framework-hunit
+, test-framework-quickcheck2
+, data-default
+, ghc-paths
+, haskell-src-exts
+, haskell-src-meta
+, optparse-applicative
+, system-fileio
+, system-filepath
+, text-binary
+, unordered-containers
+, cabal-install
+, wl-pprint-text
+, base16-bytestring
+, executable-path
+, transformers-compat
+, haddock-api
+, regex-posix
+, callPackage
+
+, bootPkgs, gmp
+, jailbreak-cabal
+
+, runCommand
+, nodejs, stdenv, filepath, HTTP, HUnit, mtl, network, QuickCheck, random, stm
+, time
+, zlib, aeson, attoparsec, bzlib, hashable
+, lens
+, parallel, safe, shelly, split, stringsearch, syb
+, tar, terminfo
+, vector, yaml, fetchgit, fetchFromGitHub, Cabal
+, alex, happy, git, gnumake, autoconf, patch
+, automake, libtool
+, cryptohash
+, haddock, hspec, xhtml, primitive, cacert, pkgs
+, coreutils
+, libiconv
+
+, ghcjsBootSrc ? fetchgit {
+    url = git://github.com/ghcjs/ghcjs-boot.git;
+    rev = "b000a4f4619b850bf3f9a45c9058f7a51e7709c8";
+    sha256 = "164v0xf33r6mnympp6s70v8j6g7ccyg7z95gjp43bq150ppvisbq";
+    fetchSubmodules = true;
+  }
+, ghcjsBoot ? import ./ghcjs-boot.nix {
+    inherit runCommand;
+    src = ghcjsBootSrc;
+  }
+, shims ? import ./head_shims.nix { inherit fetchFromGitHub; }
+}:
+let
+  inherit (bootPkgs) ghc;
+  version = "0.2.020161101";
+
+in mkDerivation (rec {
+  pname = "ghcjs";
+  inherit version;
+  src = fetchFromGitHub {
+    owner = "ghcjs";
+    repo = "ghcjs";
+    rev = "899c834a36692bbbde9b9d16fe5b92ce55a623c4";
+    sha256 = "024yj4k0dxy7nvyq19n3xbhh4b4csdrgj19a3l4bmm1zn84gmpl6";
+  };
+  isLibrary = true;
+  isExecutable = true;
+  jailbreak = true;
+  doHaddock = false;
+  doCheck = false;
+  buildDepends = [
+    filepath HTTP mtl network random stm time zlib aeson attoparsec
+    bzlib data-default ghc-paths hashable haskell-src-exts haskell-src-meta
+    lens optparse-applicative parallel safe shelly split
+    stringsearch syb system-fileio system-filepath tar terminfo text-binary
+    unordered-containers vector wl-pprint-text yaml
+    alex happy git gnumake autoconf automake libtool patch gmp
+    base16-bytestring cryptohash executable-path haddock-api
+    transformers-compat QuickCheck haddock hspec xhtml
+    regex-posix libiconv
+  ];
+  buildTools = [ nodejs git ];
+  testDepends = [
+    HUnit test-framework test-framework-hunit
+  ];
+  patches = [ ./ghcjs.patch ];
+  postPatch = ''
+    substituteInPlace Setup.hs \
+      --replace "/usr/bin/env" "${coreutils}/bin/env"
+
+    substituteInPlace src/Compiler/Info.hs \
+      --replace "@PREFIX@" "$out"          \
+      --replace "@VERSION@" "${version}"
+
+    substituteInPlace src-bin/Boot.hs \
+      --replace "@PREFIX@" "$out"     \
+      --replace "@CC@"     "${stdenv.cc}/bin/cc"
+  '';
+  preBuild = ''
+    export HOME="$TMP"
+
+    local topDir=$out/lib/ghcjs-${version}
+    mkdir -p $topDir
+
+    cp -r ${ghcjsBoot} $topDir/ghcjs-boot
+    chmod -R u+w $topDir/ghcjs-boot
+
+    cp -r ${shims} $topDir/shims
+    chmod -R u+w $topDir/shims
+
+    # Make the patches be relative their corresponding package's directory.
+    # See: https://github.com/ghcjs/ghcjs-boot/pull/12
+    for patch in "$topDir/ghcjs-boot/patches/"*.patch; do
+      echo "fixing patch: $patch"
+      sed -i -e 's@ \(a\|b\)/boot/[^/]\+@ \1@g' $patch
+    done
+  '';
+  # We build with --quick so we can build stage 2 packages separately.
+  # This is necessary due to: https://github.com/haskell/cabal/commit/af19fb2c2d231d8deff1cb24164a2bf7efb8905a
+  # Cabal otherwise fails to build: http://hydra.nixos.org/build/31824079/nixlog/1/raw
+  postInstall = ''
+    PATH=$out/bin:$PATH LD_LIBRARY_PATH=${gmp.out}/lib:${stdenv.cc}/lib64:$LD_LIBRARY_PATH \
+      env -u GHC_PACKAGE_PATH $out/bin/ghcjs-boot \
+        --dev \
+        --quick \
+        --with-cabal ${cabal-install}/bin/cabal \
+        --with-gmp-includes ${gmp.dev}/include \
+        --with-gmp-libraries ${gmp.out}/lib
+  '';
+  passthru = let
+    ghcjsNodePkgs = callPackage ../../../top-level/node-packages.nix {
+      generated = ./node-packages-generated.nix;
+      self = ghcjsNodePkgs;
+    };
+  in {
+    inherit bootPkgs;
+    isCross = true;
+    isGhcjs = true;
+    inherit nodejs ghcjsBoot;
+    inherit (ghcjsNodePkgs) "socket.io";
+
+    # This is the list of the Stage 1 packages that are built into a booted ghcjs installation
+    # It can be generated with the command:
+    # nix-shell -p haskell.packages.ghcjs.ghc --command "ghcjs-pkg list | sed -n 's/^    \(.*\)-\([0-9.]*\)$/\1_\2/ p' | sed 's/\./_/g' | sed 's/^\([^_]*\)\(.*\)$/      \"\1\"/'"
+    stage1Packages = [
+      "array"
+      "base"
+      "binary"
+      "rts"
+      "bytestring"
+      "containers"
+      "deepseq"
+      "directory"
+      "filepath"
+      "ghc-prim"
+      "ghcjs-prim"
+      "integer-gmp"
+      "old-locale"
+      "pretty"
+      "primitive"
+      "process"
+      "template-haskell"
+      "time"
+      "transformers"
+      "unix"
+    ];
+
+    mkStage2 = import ./stage2.nix {
+      inherit ghcjsBoot;
+    };
+  };
+
+  homepage = "https://github.com/ghcjs/ghcjs";
+  description = "A Haskell to JavaScript compiler that uses the GHC API";
+  license = stdenv.lib.licenses.bsd3;
+  platforms = ghc.meta.platforms;
+  maintainers = with stdenv.lib.maintainers; [ jwiegley cstrahan ];
+})
diff --git a/pkgs/development/compilers/ghcjs/head_shims.nix b/pkgs/development/compilers/ghcjs/head_shims.nix
new file mode 100644
index 000000000000..e321978f0bdc
--- /dev/null
+++ b/pkgs/development/compilers/ghcjs/head_shims.nix
@@ -0,0 +1,7 @@
+{ fetchFromGitHub }:
+fetchFromGitHub {
+  owner = "ghcjs";
+  repo = "shims";
+  rev = "1f555d3ca072c61862cc35f92f5ac05f3b938a37";
+  sha256 = "1pciyrlrp5i9s4s8ai4dvhihcahazva6fg0graxxxkjdvnl789ws";
+}
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index e1079f354d1d..f305c55dbfa5 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -58,6 +58,9 @@ rec {
     ghcjs = packages.ghc7103.callPackage ../development/compilers/ghcjs {
       bootPkgs = packages.ghc7103;
     };
+    ghcjsHEAD = packages.ghc801.callPackage ../development/compilers/ghcjs/head.nix {
+      bootPkgs = packages.ghc801;
+    };
 
     jhc = callPackage ../development/compilers/jhc {
       inherit (packages.ghc763) ghcWithPackages;
@@ -126,6 +129,10 @@ rec {
       ghc = compiler.ghcjs;
       compilerConfig = callPackage ../development/haskell-modules/configuration-ghcjs.nix { };
     };
+    ghcjsHEAD = callPackage ../development/haskell-modules {
+      ghc = compiler.ghcjsHEAD;
+      compilerConfig = callPackage ../development/haskell-modules/configuration-ghcjs.nix { };
+    };
 
     # These attributes exist only for backwards-compatibility so that we don't break
     # stack's --nix support. These attributes will disappear in the foreseeable