Hi, Upstream have released PHP 5.4.0RC8 (unplanned new RC). Because of deadlock issue, they have disable ZEND_SIGNALS This change could break some extensions (it seems APC is the only one affected, so have been rebuild). php-5.4.0-0.4.RC8.fc17 should be in f17/rawhide now. Remi. P.S. RC8 is also in f17 buildroot overrides