anchor.diff:  
     meta = {
       description = "A viewer for remote virtual machines";
  -    maintainers = [ maintainers.raskin ];
  -    platforms = platforms.linux;
  +    maintainers = with maintainers; [ raskin atemu ];
  +    platforms = with platforms; linux ++ darwin;
       license = licenses.gpl2;
     };
     passthru = {
  
positive.code:     libvirt-glib
      libxml2
      vte
    ] ++ optionals spiceSupport [
      gdbm
      libcap
      spice-gtk_libsoup2
      spice-protocol
    ];
  
    # Required for USB redirection PolicyKit rules file
    propagatedUserEnvPkgs = optional spiceSupport spice-gtk_libsoup2;
  
negative.code: 
  assert spiceSupport -> (
    gdbm != null
    && (stdenv.isLinux -> libcap != null)
    && spice-gtk_libsoup2 != null
    && spice-protocol != null
  );
  