test.nix

{ pkgs }:
rec {
   cratesIO = pkgs.callPackage ./crates-io.nix {};
   crates = pkgs.callPackage ./Cargo.nix { inherit cratesIO; };
   
   package = (crates.my-package {}).override {
     crateOverrides = (pkgs.defaultCrateOverrides // {
        libssh2-sys =  _: {
          buildInputs = [ pkgs.zlib pkgs.openssl ];
        };
     });
   };
}