{
  description = "Dev Setup";

  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
  inputs.flake-utils.url = "github:numtide/flake-utils";
  inputs.pip2nix = {
    url = "github:nix-community/pip2nix";
    flake = false;
    # inputs.nixpkgs.follows = "nixpkgs"; # inputs.flake-utils.follows = "flake-utils";
  };

  outputs = {nixpkgs, flake-utils, pip2nix, ...}:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs { inherit system;
                                config.allowBroken = true;
                              };
        #attrsets = pkgs.lib.attrsets;
        #overrideFiles = (attrsets.filterAttrs (f: type: type == "regular") (builtins.readDir ./python));
        #overridePackageNames = attrsets.mapAttrsToList (f: _:  builtins.replaceStrings [".nix"] [""] f) overrideFiles;
        py = pkgs.callPackage ./python.nix { inherit pkgs; };
        #  packageOverrides = pself: psuper:
        #    attrsets.genAttrs overridePackageNames (o: pself.callPackage ./python/${o}.nix {});
        #});
        #newversion = python3.pkgs.newversion.overrideAttrs(old: {
        #  propagatedBuildInputs = old.propagatedBuildInputs ++ [python3.pkgs.setuptools];
        #});
        assets = pkgs.callPackage ./node/frappe-assets.nix {};
        # Source: https://github.com/frappe/frappe_docker/blob/main/resources/nginx-template.conf
        nginx-conf = pkgs.callPackage ./nginx-erpnext-conf.nix {inherit pkgs;};
        penv = py.buildEnv.override {
          extraLibs = [ py.pkgs.frappe py.pkgs.erpnext ];
        };
        runErpNext = pkgs.writeShellScriptBin "runErpNext" ''
          export PYTHON_PATH=${penv}/${py.sitePackages}
          # The upstream installer bench CLI wants mysql in its PATH
          export PATH=${pkgs.mariadb-client}/bin:''$PATH

          hostname=localhost
          tmp=/tmp/erpnext

          mkdir -p $tmp/apps $tmp/sites $tmp/config/pids $tmp/logs $tmp/env/bin

          for f in ${assets}/share/sites/*; do
              ln -s "$f" "$tmp/sites/$(basename $f)"
          done

          cat >$tmp/sites/common_site_config.json <<EOF
          {
            "db_host": "localhost",
            "db_port": 3306,
            "db_name": "erpnext" ,
            "db_password": "erpnext" ,
            "redis_cache": "redis://localhost",
            "redis_queue": "redis://localhost",
            "redis_socketio": "redis://localhost",
            "socketio_port": 6379
          }
          EOF

          # The upstream bench CLI installer expects this file
          echo -e "erpnext\nfrappe\n" > $tmp/sites/apps.txt

          cd $tmp
          ln -s ${py.pkgs.erpnext}/lib/python3.10/site-packages apps/erpnext
          ln -s ${py.pkgs.frappe}/lib/python3.10/site-packages apps/frappe
          ln -s ${penv} $tmp/env
          ln -sf ${nginx-conf} $tmp/nginx-erpnext.conf

          # Upstream initializes the DB with this command
          ${py.pkgs.bench}/bin/bench new-site localhost --mariadb-root-password password --admin-password admin

          echo "Workdir: $tmp"
          ${penv}/bin/gunicorn --chdir="$tmp/sites" --bind=0.0.0.0:9090 --threads=4 --workers=2 --worker-class=gthread --worker-tmp-dir=/dev/shm --timeout=120 --preload frappe.app:application
        '';
      in rec {
        packages = {
          devEnv = pkgs.buildEnv {
            name = "erpnext-nix-dev-env";
            paths = [
              pkgs.dasel
            ];
          };
          inherit pkgs runErpNext assets;
          pip2nix = import "${pip2nix}/default.nix" { inherit pkgs; pythonPackages = "python310Packages"; };
          erpnext = py.pkgs.erpnext;
          bench = py.pkgs.bench;
          pythonPkgs = py.pkgs;
        };
    });
}