Hi, I have been using CentOS 4 on a UML (User-Mode Linux) box for some time (>1 year) and have kept up to date with updates. I think I started on CentOS 4.1 and have progressively "yum update"'d since. User-Mode Linux, or at least the version of it that my hosts use, doesn't support NPTL. This hasn't been a problem to date; I've just moved /lib/tls out of the way, as described in http://www.mythic-beasts.com/umlwiki/wiki.pl?2.6_And_TLS . No problems at all, until a recent libstdc++ update. The old version was: libstdc++-3.4.5-2 but with an update to CentOS 4.4 the new version is: libstdc++-3.4.6-3 Now, with the 3.4.6-3 version, when I restart Apache, I get: Cannot load /etc/httpd/modules/libphp4.so into server: libstdc++.so.6: cannot handle TLS data. Reverting back to the old libstdc++ makes things work fine again. In both instances my /lib/tls is empty. Can anyone offer any advice? Is this a bug in the libstdc++ package? Is there a likely workaround? I'm afraid I don't know enough about NPTL/libstdc++ to really understand the details of what's going on here. Thanks, Tim