diff --git a/pkgs/development/libraries/haskell/fay/default.nix b/pkgs/development/libraries/haskell/fay/default.nix
new file mode 100644
index 00000000000..d7c8ba5a447
--- /dev/null
+++ b/pkgs/development/libraries/haskell/fay/default.nix
@@ -0,0 +1,30 @@
+{ cabal, aeson, attoparsec, Cabal, cpphs, dataDefault, filepath
+, ghcPaths, haskellNames, haskellPackages, haskellSrcExts, HUnit
+, languageEcmascript, mtl, optparseApplicative, prettyShow, safe
+, sourcemap, split, syb, testFramework, testFrameworkHunit
+, testFrameworkTh, text, time, uniplate, unorderedContainers
+, utf8String, vector
+}:
+
+cabal.mkDerivation (self: {
+  pname = "fay";
+  version = "0.18.1.3";
+  sha256 = "1m747l2555w1jkdwh8b851mxvngiy7l7sbkwvm2il6k5ygcz5gbv";
+  isLibrary = true;
+  isExecutable = true;
+  buildDepends = [
+    aeson attoparsec Cabal cpphs dataDefault filepath ghcPaths
+    haskellNames haskellPackages haskellSrcExts HUnit
+    languageEcmascript mtl optparseApplicative prettyShow safe
+    sourcemap split syb testFramework testFrameworkHunit
+    testFrameworkTh text time uniplate unorderedContainers utf8String
+    vector
+  ];
+  meta = {
+    homepage = "http://fay-lang.org/";
+    description = "A compiler for Fay, a Haskell subset that compiles to JavaScript";
+    license = self.stdenv.lib.licenses.bsd3;
+    platforms = self.ghc.meta.platforms;
+    maintainers = [ self.stdenv.lib.maintainers.ocharles ];
+  };
+})
diff --git a/pkgs/development/libraries/haskell/sourcemap/default.nix b/pkgs/development/libraries/haskell/sourcemap/default.nix
new file mode 100644
index 00000000000..602654b0a01
--- /dev/null
+++ b/pkgs/development/libraries/haskell/sourcemap/default.nix
@@ -0,0 +1,17 @@
+{ cabal, aeson, attoparsec, text, unorderedContainers, utf8String
+}:
+
+cabal.mkDerivation (self: {
+  pname = "sourcemap";
+  version = "0.1.2.0";
+  sha256 = "040j2k1cwzlq5pybs6cg7wmf0x5i22zdidv2xvzdvgi5v7gf6kp1";
+  buildDepends = [
+    aeson attoparsec text unorderedContainers utf8String
+  ];
+  meta = {
+    description = "Implementation of source maps as proposed by Google and Mozilla";
+    license = self.stdenv.lib.licenses.bsd3;
+    platforms = self.ghc.meta.platforms;
+    maintainers = [ self.stdenv.lib.maintainers.ocharles ];
+  };
+})
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index ff06573af55..3dab134935f 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -1036,6 +1036,8 @@ let result = let callPackage = x : y : modifyPrio (newScope result.finalReturn x
 
   executablePath = callPackage ../development/libraries/haskell/executable-path {};
 
+  fay = callPackage ../development/libraries/haskell/fay {};
+
   filepath_1_3_0_0 = callPackage ../development/libraries/haskell/filepath {};
   filepath = null; # a core package in recent GHCs
 
@@ -2175,6 +2177,8 @@ let result = let callPackage = x : y : modifyPrio (newScope result.finalReturn x
 
   socketActivation = callPackage ../development/libraries/haskell/socket-activation {};
 
+  sourcemap = callPackage ../development/libraries/haskell/sourcemap {};
+
   split_0_2_1_1 = callPackage ../development/libraries/haskell/split/0.2.1.1.nix {};
   split_0_2_2 = callPackage ../development/libraries/haskell/split/0.2.2.nix {};
   split = self.split_0_2_2;