nix flake devshell

flake.nix

{
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs?rev=d9a1414346059619d9e13ab93e749bbb82e5252a";
  };

  outputs = inputs @ { nixpkgs, ... }:
    let
      system = "x86_64-darwin";
      pkgs = import nixpkgs { inherit system; };

      # Use `nix-prefetch-url --unpack https://...` to get the sha256
      protobuf = pkgs.fetchzip {
        url = "https://github.com/protocolbuffers/protobuf/releases/download/v21.6/protoc-21.6-osx-universal_binary.zip";
        sha256 = "05xysnjx29j8zv7jdwhy5vx06qwp9j3y2jkiszkzf6yvampqb8w8";
      };

    in
    {
      devShells.${system}.default = pkgs.mkShell {
        buildInputs = [
          protobuf
        ];
      };
    };
}