libphp4.so not built on 2nd configure

I cannot install an updated configuration of PHP-4.0.6 (downloaded source code), onto my Madrake Linux 6.5 installation Apache 1.3.9-7mdk. It worked the first time I ran ./configure with all the options I wanted, and overwrote the PHP3 package installed with the Mandrake distribution. But I then wanted to change the configuration options (to add Oracle support) but could not get the updated version recognised. I deleted the config.cache file ran "make clean" (followed by "make" and "make install"), and restarted Apache, but still the original configuration remains. I then rather brutally deleted all files containing "php" in the filename and unpacked again from source, thinking this would fix it. Unfortunately the shared library "libphp4.so" nor the module "mod_php4.c" were rebuilt. I am not getting any obvious failure message during configuration or making. However, I have subsequently tried to install glibc-devel from the Mandrake distribution and get the log error of: "Installing glibc-devel. install-info: No such file or directory for /usr/info/libc.info.bz2 execution of script failed" and wonder whether this is significant. Does anybody have any ideas.