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You have installed the php4-cgi package.

Have a look at the php4-cgi port if you need additional extensions other than
CTYPE, MYSQL, OVERLOAD, PCRE, POSIX, SESSION, TOKENIZER, XML and ZLIB.

You can find it at
ftp://ftp.freebsd.org/pub/FreeBSD/FreeBSD-current/ports/www/php4-cgi.tar

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