{
  nixpkgs,
  shellrc,
  system,
}: let
  callDevelop = nixpkgs.lib.callPackageWith ({
      inherit system;
      inherit nixpkgs;
    }
    // shells);

  shells = {
    default = nixpkgs.legacyPackages.${system}.mkShell {
      inputsFrom = [shellrc.packages.${system}.default];
    };

    armv6 = callDevelop ./nuttx.nix {arch = "armv6s-m";};
    armv7e = callDevelop ./nuttx.nix {
      arch = "armv7e-m";
      fpu = "vfpv3-d16";
    };
    espc = callDevelop ./nuttx.nix {arch = "rv32imc";};
    c = callDevelop ./c.nix {};
    qt = callDevelop ./qt.nix {};
    apo = callDevelop ./apo.nix {};
  };
in
  shells