To build PHP as an fhttpd module, answer "yes" to "Build as an
    fhttpd module?" (the 
    --with-fhttpd=DIR
    option to configure) and specify the fhttpd source base
    directory.  The default directory is /usr/local/src/fhttpd. If you are
    running fhttpd, building PHP as a module will give better
    performance, more control and remote execution capability.
   
Note: 
     Support for fhttpd is no longer available as of PHP 4.3.0.