anchor.diff:  
   buildGoModule rec {
     pname = "tailscale";
  -  version = "0.97-219";
  +  # Tailscale uses "git describe" as version numbers. 0.99.1-0 means
  +  # "tag v0.99.1 plus 0 commits", which corresponds to rev="v0.99.1"
  +  # below.
  +  version = "0.99.1-0";
   
     src = fetchFromGitHub {
       owner = "tailscale";
       repo = "tailscale";
  -    # Tailscale uses "git describe" as version numbers. v0.97-219
  -    # means "tag v0.97 plus 219 commits", which is what this rev is.
  -    rev = "afbfe4f217a2a202f0eefe943c7c1ef648311339";
  -    sha256 = "1an897ys3gycdmclqd0yqs9f7q88zxqxyc6r0gcgs4678svxhb68";
  +    rev = "v0.99.1";
  +    sha256 = "1kq4x5xknv0qq6n78xj5wjbf6svbdyw4nzs7z5gjb3ylj2vl97pb";
     };
   
     nativeBuildInputs = [ makeWrapper ];
  
positive.code:   CGO_ENABLED = 0;
  
    goPackagePath = "tailscale.com";
    overrideModAttrs = (_: {
      preBuild = ''
      rm ipn/e2e_test.go
      rm control/controlclient/auto_test.go
      rm control/controlclient/direct_test.go
      '';
    });
    vendorSha256 = "1v90lbwgrc2m4kvpglf2jykrm8rry3pbhqqbc3mcysrzmqlw84yl";
    subPackages = [ "cmd/tailscale" "cmd/tailscaled" ];
  
    postInstall = ''
  
negative.code:     license = licenses.bsd3;
      maintainers = with maintainers; [ danderson mbaillie ];
    };
  }
  