libstartup-notification-dev.tcz
   libxcb-dev.tcz
      Xorg-7.6-dev.tcz
      libxcb.tcz
      libpthread-stubs.tcz
   libxcb-util-dev.tcz
      libxcb-dev.tcz
         Xorg-7.6-dev.tcz
         libxcb.tcz
         libpthread-stubs.tcz