smarty 2.6.0_rc1 doesn't install /usr/lib/php/Smarty/core files, so all those php scripts use smarty 2.5 before wouldn't work. and i've made a patch to get that work correctly.
Created attachment 18459 [details, diff] smarty-2.6.0_rc1.ebuild fix. a proper fix. even added some more notice.
in cvs
resolve conformed. closing the bug.