Hey, how can I allow unfree packages in my unstable flake overlay?
NVM i found a way

{ config, pkgs, ... }:
              let
                overlay-unstable = final: prev: {
                  unstable = import nixpkgs-unstable {
                    system = "x86_64-linux";
                    config.allowUnfree = true;
                  };
                };
              in
              {
                nixpkgs.overlays = [ overlay-unstable ];
              }

Hey, how can I allow unfree packages in my unstable flake overlay?
NVM i found a way

{ config, pkgs, ... }:
              let
                overlay-unstable = final: prev: {
                  unstable = import nixpkgs-unstable {
                    system = "x86_64-linux";
                    config.allowUnfree = true;
                  };
                };
              in
              {
                nixpkgs.overlays = [ overlay-unstable ];
              }

I created a post on discourse but I wanted to ask here as well:

I'm trying to set up a dev environment using flakes so that I can develop cores for the MiSTer FPGA project. The project requires version 17.0.2.602 of Quartus Prime, the Intel (né Altera) FPGA IDE.

Nixpkgs-unstable currently references 23.1std.0.991. Is it possible (and reasonable) to somehow adapt quartus.nix so that I can create a flake that uses v17.0.2.602?