anchor.diff:    mesaSupported =
       system == "i686-linux" ||
       system == "x86_64-linux" ||
  +    system == "x86_64-darwin" ||
       system == "i686-darwin";
   
     mesa = import ../development/libraries/mesa {
  
positive.code: 
    rsync = import ../applications/networking/sync/rsync {
      inherit fetchurl stdenv acl;
      enableACLs = system != "i686-darwin";
    };
  
    rxvt = import ../applications/misc/rxvt {
  
negative.code:       libpng libjpeg libungif libtiff texinfo dbus;
      inherit (xlibs) libXaw libXpm libXft;
      inherit (gtkLibs) gtk;
      xawSupport = stdenv.isDarwin || getPkgConfig "emacs" "xawSupport" false;
      xaw3dSupport = getPkgConfig "emacs" "xaw3dSupport" false;
      gtkGUI = getPkgConfig "emacs" "gtkSupport" true;
      xftSupport = getPkgConfig "emacs" "xftSupport" true;
  