anchor.diff:      inherit devicemapper;
     };
   
  -  libuuid = if stdenv.system != "i686-darwin" then utillinuxng else null;
  +  libuuid = if ! stdenv.isDarwin then utillinuxng else null;
   
     e2fsprogs = import ../os-specific/linux/e2fsprogs {
       inherit fetchurl stdenv pkgconfig libuuid;
  
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;
  