{
  description = "Dev Setup";

  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";

  inputs.systems.url = "github:nix-systems/default";

  inputs.devshell.url = "github:numtide/devshell";
  inputs.devshell.inputs.nixpkgs.follows = "nixpkgs";
  inputs.devshell.inputs.systems.follows = "systems";

  outputs = {self, nixpkgs, systems, devshell }:
    let
      eachSystem = nixpkgs.lib.genAttrs (import systems);
      # Nixpkgs instantiated for system types in nix-systems
      nixpkgsFor = eachSystem (system:
        import nixpkgs {
          inherit system;
          overlays = [
            self.overlays.default
            self.overlays.pythonOverlay
            devshell.overlays.default
          ];
        }
      );
    in
    {
      overlays = {
        default = (import ./overlay.nix);
        pythonOverlay = (import ./python-overlay.nix);
      };
      devShells = eachSystem (system:
      let
        pkgs = nixpkgsFor.${system};
      in
      {
        default = pkgs.devshell.mkShell {
          # Add additional packages you'd like to be available in your devshell
          # PATH here
          devshell.packages = with pkgs; [
          ];
          commands = [
            {
              help = pkgs.cachix.meta.description;
              name = pkgs.cachix.pname;
              package = pkgs.cachix;
            }
          ];
          bash.extra = ''
          '';
        };
      });
      packages = eachSystem (system:
      let
        pkgs = nixpkgsFor.${system};
      in
      {
        run-erpnext = pkgs.run-erpnext;
        erpnext = pkgs.python3.pkgs.erpnext;
        bench = pkgs.python3.pkgs.bench;
      });
      nixosConfigurations =
      let
        system = "x86_64-linux";
        pkgs = nixpkgsFor.${system};
      in
      {
        test-vm = nixpkgs.lib.nixosSystem {
          inherit system pkgs;
          modules = [./test-vm/configuration.nix];
        };
      };
    };
}