My purpose in SimulaVR to create flake.nix

flake.nix

{
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/63dacb46bf939521bdc93981b4cbb7ecb58427a0";
    systems.url = "github:nix-systems/default-linux";
    flake-parts = {
      url = "github:hercules-ci/flake-parts";
      inputs.nixpkgs-lib.follows = "nixpkgs";
    };
    nixgl = {
      url = "github:nix-community/nixGL";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs =
    inputs:
    inputs.flake-parts.lib.mkFlake { inherit inputs; } {
      systems = import inputs.systems;

      perSystem =
        { pkgs, system, ... }:
        let
          simula-onNixOS-dev = pkgs.callPackage ./. { devBuild = true; onNixOS = true; };
          simula-onNixOS-release = pkgs.callPackage ./. { devBuild = false; onNixOS = true; };
          simula-onNonNixOS-dev = pkgs.callPackage ./. { devBuild = true; onNixOS = false; };
          simula-onNonNixOS-release = pkgs.callPackage ./. { devBuild = false; onNixOS = false; };
        in
        {
          _module.args.pkgs = import inputs.nixpkgs {
            inherit system;
            overlays = [ inputs.nixgl.overlays.default ];
          };

          checks = {
            inherit
              simula-onNixOS-dev
              simula-onNixOS-release
              simula-onNonNixOS-dev
              simula-onNonNixOS-release
              ;
          };

          packages = {
            inherit
              simula-onNixOS-dev
              simula-onNixOS-release
              simula-onNonNixOS-dev
              simula-onNonNixOS-release
              ;
          };
        };
    };
}