Ali...I hope you don't regret being so generous with your time....

default-goundhog-ghcjs.nix

{ mkDerivation, base, stdenv, template-haskell }:
mkDerivation {
  pname = "groundhog-ghcjs";
  version = "0.1.0.0";
  src = ./.;
  libraryHaskellDepends = [ base template-haskell ];
  jailbreak = true;
  doCheck = false;
  homepage = "http://github.com/mightybyte/groundhog-ghcjs";
  description = "Groundhog GHCJS compatibility";
  license = stdenv.lib.licenses.bsd3;

default.nix

{ reflex-platform ? import ./reflex-platform {} }:

reflex-platform.project ({ pkgs, ... }: {
  packages = {
    common = ./common;
    backend = ./backend;
    frontend = ./frontend;
  };

  shells = {
    ghc = ["common" "backend" "frontend"];
    ghcjs = ["common" "frontend"];
  };

   overrides = self: super: rec {
     common = pkgs.haskell.lib.doJailbreak  (self.callPackage ./common/common.nix {});
     dc = pkgs.haskell.lib.dontCheck;
     jb = pkgs.haskell.lib.doJailbreak;
     
     android_sdk.accept_license = true;
     snap-core = dc (self.callPackage ./packages/snap-core.nix {});
     snap = dc (self.callPackage ./packages/snap.nix {});
     snap-server = dc (self.callPackage ./packages/snap-server.nix {});
     servant = dc (self.callPackage ./packages/servant.nix {});
     servant-snap = dc (jb (self.callPackage  ./packages/servant-snap.nix {}));    
     
     servant-reflex = self.callPackage ./packages/servant-reflex.nix {};
     servant-client-core = self.callPackage ./packages/servant-client-core.nix {};
     servant-client = self.callPackage ./packages/servant-client.nix {};
     servant-server = self.callPackage ./packages/servant-server.nix {};
     groundhog-ghcjs= self.callPackage ./packages/
     };        

     shellToolOverrides = ghc: super: {
       
    };

})

groundhog-ghcjs

 nix-build --attr groundhog-ghcjs release.nix
these derivations will be built:
  /nix/store/0aw0k2pzibffd8l71hr29in5wnxmcnwa-remove-references-to.drv
  /nix/store/h2ns7z4769kkj2gsvybl22h1lr5xbkar-groundhog-ghcjs-0.1.0.0.drv
building '/nix/store/0aw0k2pzibffd8l71hr29in5wnxmcnwa-remove-references-to.drv'...
dyld: Library not loaded: /usr/lib/system/libsystem_network.dylib
  Referenced from: /nix/store/8ykfqv6jx9jvfhnc4cdygdzg0piy8253-Libsystem-osx-10.11.6/lib/libSystem.B.dylib
  Reason: image not found
builder for '/nix/store/0aw0k2pzibffd8l71hr29in5wnxmcnwa-remove-references-to.drv' failed due to signal 6 (Abort trap: 6)
cannot build derivation '/nix/store/h2ns7z4769kkj2gsvybl22h1lr5xbkar-groundhog-ghcjs-0.1.0.0.drv': 1 dependencies couldn't be built
error: build of '/nix/store/h2ns7z4769kkj2gsvybl22h1lr5xbkar-groundhog-ghcjs-0.1.0.0.drv' failed

tryCompileOnMac

nix-build -A ghc.backend
error: syntax error, unexpected '}', expecting ';', at /Users/evan/Documents/reflex/try/mod/soap/default.nix:33:6
bash-3.2$