anchor.diff:  { stdenv, lib, fetchurl, autoconf, automake, pkgconfig, libtool
  -, gtk2, halibut, ncurses, perl
  +, gtk2, halibut, ncurses, perl, darwin
   }:
   
   stdenv.mkDerivation rec {
  -  version = "0.71";
  +  version = "0.73";
     pname = "putty";
   
     src = fetchurl {
  
positive.code:       "https://the.earth.li/~sgtatham/putty/${version}/${pname}-${version}.tar.gz"
        "ftp://ftp.wayne.edu/putty/putty-website-mirror/${version}/${pname}-${version}.tar.gz"
      ];
      sha256 = "1f66iss0kqk982azmxbk4xfm2i1csby91vdvly6cr04pz3i1r4rg";
    };
  
    # glib-2.62 deprecations
  
negative.code:   nativeBuildInputs = [ autoconf automake halibut libtool perl pkgconfig ];
    buildInputs = lib.optionals stdenv.hostPlatform.isUnix [
      gtk2 ncurses
    ] ++ lib.optional stdenv.isDarwin darwin.apple_sdk.libs.utmp;
    enableParallelBuilding = true;
  
    meta = with lib; {
  