When I compile php 4.0.6 as a module (so) for apache 1.3.19
everything looks ok.

even though when I try to start apache I get the following error message:

Unable to load dynamic library '/usr/local/lib/php/extensions/imap.so' - /usr/local/lib/php/extensions/imap.so: undefined symbol: mxdriver in Unknown on line 0

I compiled php with : 
--with-imap=shared

I also downloaded the laters c-client and copied the files to the location as described in the manual.

The shared object is much smaller as the one I compiled with the previous version of php (4.0.5).

With kind regards,
    Serge van Thillo