diff --git a/pkgs/development/libraries/haskell/slack-api/default.nix b/pkgs/development/libraries/haskell/slack-api/default.nix
new file mode 100644
index 00000000000..d5ed545a17d
--- /dev/null
+++ b/pkgs/development/libraries/haskell/slack-api/default.nix
@@ -0,0 +1,19 @@
+{ cabal, aeson, errors, HsOpenSSL, ioStreams, lens, lensAeson
+, monadLoops, mtl, network, opensslStreams, text, time
+, transformers, websockets, wreq
+}:
+
+cabal.mkDerivation (self: {
+  pname = "slack-api";
+  version = "0.2";
+  sha256 = "0gw6x57nnc16fm963l8z96cm4xapr4nbbmrbpx73k928a07fdq8j";
+  buildDepends = [
+    aeson errors HsOpenSSL ioStreams lens lensAeson monadLoops mtl
+    network opensslStreams text time transformers websockets wreq
+  ];
+  meta = {
+    description = "Bindings to the Slack RTM API";
+    license = self.stdenv.lib.licenses.mit;
+    platforms = self.ghc.meta.platforms;
+  };
+})