{
  npins ? import ./npins,
  nixpkgs ? npins.nixpkgs,
  pkgs ? import nixpkgs { },
  lib ? pkgs.lib,
  ...
}:

lib.makeScope pkgs.newScope (
  self:
  let
    addProtobuf = oldAttrs: {
      nativeBuildInputs = oldAttrs.nativeBuildInputs or [ ] ++ [
        (self.callPackage ({ protobuf }: protobuf) { })
      ];
    };
  in
  {
    sidx-crate2nix = (
      self.callPackage ./Cargo.nix {
        defaultCrateOverrides = pkgs.defaultCrateOverrides // {
          sidx = oldAttrs: {
            src =
              let
                fs = pkgs.lib.fileset;
              in
              fs.toSource {
                root = ./.;
                fileset = fs.unions [
                  ./src
                  ./Cargo.toml
                  ./Cargo.lock
                ];
              };
          };
          snix-castore = addProtobuf;
          # prost-wkt-types = addProtobuf;
          # openssl-sys = oldAttrs: {
          #   nativeBuildInputs = oldAttrs.buildInputs or [ ] ++ [
          #     (self.callPackage ({ pkg-config }: pkg-config) { })
          #   ];
          #   buildInputs = oldAttrs.buildInputs or [ ] ++ [
          #     (self.callPackage ({ openssl }: openssl) { })
          #   ];
          # };
        };
      }
    );
    sidx = self.sidx-crate2nix.rootCrate.build;
  }
)