OK, i've found php-5 RPMs in the centosplus dir on mirrors. Sorry for my ignorance, but what's the difference between php-5.1.6-1.2.1.centos.x86_64.rpm and php-5.1.6-3.el4s1.5.x86_64.rpm ? There's other such examples in the same dir. Anyway, i opted to try installing the "el4" variety, along with the comparable RPM for php-mysql, but --after satisfying other dependencies-- ran into this: libmysqlclient.so.15()(64bit) is needed by php-mysql-5.1.6-3.el4s1.5.x86_64 libmysqlclient.so.15(libmysqlclient_15)(64bit) is needed by php-mysql-5.1.6-3.el4s1.5.x86_64 Which stumps me, because the libmysqlclient14-devel RPM would seem to be the latest-greatest available in that centosplus dir. Does one have to turn elsewhere for the libmysqlclient15-devel RPM that would presumably supply the right SO file? Thanks for any & all help. *----->