anchor.diff:  
   stdenv.mkDerivation rec {
     pname = "gcr";
  -  version = "3.40.0";
  +  version = "3.41.0";
  +
  +  outputs = [ "out" "dev" ];
   
     src = fetchurl {
       url = "mirror://gnome/sources/${pname}/${lib.versions.majorMinor version}/${pname}-${version}.tar.xz";
  -    sha256 = "udNkWl/ZU6VChcxk1PwEZzZGPb1NzCXK9ce1m+0wJ/U=";
  +    sha256 = "CQn8SeqK1IMtJ1ZP8v0dxmZpbioHxzlBxIgp5gVy2gE=";
     };
  -
  -  postPatch = ''
  -    patchShebangs build/ gcr/fixtures/
  -
  -    chmod +x meson_post_install.py
  -    patchShebangs meson_post_install.py
  -  '';
  -
  -  outputs = [ "out" "dev" ];
   
     nativeBuildInputs = [
       pkg-config
  
positive.code:     libgcrypt
      libtasn1
      pango
    ];
  
    propagatedBuildInputs = [
  
negative.code: 
    mesonFlags = [
      "-Dgtk_doc=false"
      # We are still using ssh-agent from gnome-keyring.
      # https://github.com/NixOS/nixpkgs/issues/140824
      "-Dssh_agent=false"
    ];
  
    doCheck = false; # fails 21 out of 603 tests, needs dbus daemon
  
    PKG_CONFIG_SYSTEMD_SYSTEMDUSERUNITDIR = "${placeholder "out"}/lib/systemd/user";
  
    postPatch = ''
      patchShebangs build/ gcr/fixtures/
  
      chmod +x meson_post_install.py
      patchShebangs meson_post_install.py
    '';
  
    preFixup = ''
      wrapProgram "$out/bin/gcr-viewer" \
  