project-m36.nix

build.sh

nix-build project-m36.nix

# to open a shell where cabal works
nix-shell -E '(import ./project-m36.nix {}).env'
# cabal build

project-m36.nix

{ pkgs ? import <nixpkgs> {} }:
with pkgs;
let
  project-m36-src = fetchFromGitHub {
    owner  = "agentm";
    repo   = "project-m36";
    rev    = "c7a5965e6ccc924c25e981d30442c3906989ba2e";
    sha256 = "04zcmkjz5kia23irs8j0g6v9dg7al7f59ajb1xaai6p4jhkgflxx";
  };
  # or point to a folder
  # project-m36-src = ./local-folder;

  haskellPkgs = haskellPackages.override {
    overrides = self: super: {
      extended-reals = haskell.lib.dontCheck super.extended-reals;  # needs newer version of HUnit
      distributed-process-systest = haskell.lib.doJailbreak super.distributed-process-systest;
      distributed-process-extras = haskell.lib.doJailbreak super.distributed-process-extras;
      distributed-process-async = haskell.lib.doJailbreak super.distributed-process-async;
      distributed-process-client-server = haskell.lib.doJailbreak super.distributed-process-client-server;
      project-m36 = haskell.lib.dontHaddock (haskell.lib.dontCheck (
        self.callCabal2nix "project-m36" project-m36-src {}));
    };
  };
in haskellPkgs.project-m36

To enable tests, get rid of haskell.lib.dontCheck for project-m36.