# emerge \<apache-2
# USE="-*" emerge php mod_php
# ebuild /var/db/pkg/dev-php/mod_php-<votre version de PHP>/mod_php-<votre version de PHP>.ebuild config
# nano /etc/conf.d/apache
  Add "-D PHP4" to APACHE_OPTS
  
# rc-update add apache default
# /etc/init.d/apache start