anchor.diff:  
     src = fetchurl {
       url = "mirror://gnome/sources/${pname}/${lib.versions.majorMinor version}/${pname}-${version}.tar.xz";
  -    sha256 = "sha256-JnbVH6H6QP3udJfT52P++hiwM4v/zS7jLn9+YzyIVEY=";
  +    sha256 = "sha256-RmueAmwfnrO2WWb1MNl3A6ghLar5EXSMFF6cuEPb1v4=";
     };
   
     nativeBuildInputs = [
  
positive.code:   doCheck = !stdenv.isDarwin;
  
    checkPhase = ''
      NO_AT_BRIDGE=1 \
      XDG_DATA_DIRS="$XDG_DATA_DIRS:${hicolor-icon-theme}/share" \
      GDK_PIXBUF_MODULE_FILE="${librsvg.out}/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache" \
      xvfb-run -s '-screen 0 800x600x24' dbus-run-session \
        --config-file=${dbus.daemon}/share/dbus-1/session.conf \
        meson test --print-errorlogs
    '';
  
    passthru = {
  
negative.code:   ];
  
    checkInputs = [
      xvfb-run
      at-spi2-atk
      at-spi2-core
  