{
  description = "IPAScrape";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };
  outputs = { flake-utils, nixpkgs, ...}: 
    flake-utils.lib.eachDefaultSystem (system:
      let pkgs = nixpkgs.legacyPackages.${system};
          ipatool = pkgs.ipatool.overrideAttrs { 
            # grab latest unreleased version, which allows downloading by app store ID
            src = pkgs.fetchFromGitHub {
              owner = "majd";
              repo = "ipatool";
              rev = "63ee6fc6a42a89d51c9caac632cefd65218825ab";
              hash = "sha256-dbsQC/CRcT1/XBVKX/k2AUcLAOeN3IuSLl4GpAGBWPI=";
            };
            vendorHash = "sha256-v1hithTdsyNAQj0E9g1nRC90WdM9z4kAQuOh6OScJss=";
          };
      in {
        devShells.default = pkgs.mkShell {
          buildInputs = [ ipatool pkgs.python3 ];
        };
      });
}