Compile PHP on 64bit CentOS:
./configure --prefix=/etc/php --bindir=/usr/bin --includedir=/usr/include --libdir=/usr/lib64 --mandir=/usr/share/man --sysconfdir=/etc/php --with-apxs2=/usr/sbin/apxs --with-config-file-path=/etc --with-mysql=/usr/bin/ --with-libdir=lib64 --with-pear --with-mcrypt --enable-mbstring