anchor.diff:    staging = fetchFromGitHub rec {
       # https://github.com/wine-staging/wine-staging/releases
       inherit (unstable) version;
  -    sha256 = "sha256-A7IcBm3LzXzFu/NT+kbf2InTTuBzyQju/uMxSnIfsls=";
  +    sha256 = "sha256-U1awbhJRT3aAJstyEjv2Dp20FqyQ4ntnFFRYJb12C/U=";
       owner = "wine-staging";
       repo = "wine-staging";
       rev = "v${version}";
  
positive.code: 
    unstable = fetchurl rec {
      # NOTE: Don't forget to change the SHA256 for staging as well.
      version = "7.12";
      url = "https://dl.winehq.org/wine/source/7.x/wine-${version}.tar.xz";
      sha256 = "sha256-gJzsE3FmNubq/Uw9pzEkVqhE0xYCClV4YRvNuiEGnGg=";
      inherit (stable) gecko32 gecko64 patches;
  
      mono = fetchurl rec {
  
negative.code: 
      ## see http://wiki.winehq.org/Gecko
      gecko32 = fetchurl rec {
        version = "2.47.3";
        url = "https://dl.winehq.org/wine/wine-gecko/${version}/wine-gecko-${version}-x86.msi";
        sha256 = "sha256-5bmwbTzjVWRqjS5y4ETjfh4MjRhGTrGYWtzRh6f0jgE=";
      };
      gecko64 = fetchurl rec {
        version = "2.47.3";
        url = "https://dl.winehq.org/wine/wine-gecko/${version}/wine-gecko-${version}-x86_64.msi";
        sha256 = "sha256-pT7pVDkrbR/j1oVF9uTiqXr7yNyLA6i0QzSVRc4TlnU=";
      };
  
      ## see http://wiki.winehq.org/Mono
  