nixpkgs.config.overlays = [(self: super: {
    nixos-unstable = import unstable-tarball {
      # pass the nixpkgs config to the unstable alias
      # to ensure `allowUnfree = true;` is propagated:
      config = config.nixpkgs.config;
    };

    plexRaw = super.plexRaw.overrideAttrs (old: rec {
      version = "1.19.3.2764-ef515a800";
      src = self.fetchurl {
        url = "https://downloads.plex.tv/plex-media-server-new/${version}/redhat/plexmediaserver-${version}.x86_64.rpm";
        sha256 = "10x4cf1c826vj9gqr7r6k70rrjifmi36sd7imfi7pdw5swizjzqv";
      };
    });
  })];