php4+imap OpenBSD _mail_string

[leandro <leandro_(_at_)_ww3brasil_(_dot_)_com>]

Hi friends... 

I am with a great problem, php4+imap does not function in OpenBSD 3,0 
that I am using, same with ports.  When initiating the apache I receive 
the message from error: 

 Undefined symbol "_ mail_string" in 
httpd:/usr/lib/apache/modules/libphp4.so

Somebody already read some article on or found a solution for the same? 

I am thankful.