Undefined symbols ....

Pleeeeease can somebody shed some light on my problem : I have seen similar problems here and have scoured the internet for about a week now and time is running out for me as I am on a deadline, but still no luck. I am a newbie so 'scuse me if I am getting it wrong. I am trying to get PHP 4.0.6 to run on Apache 2.0.18 as a DSO, ( I am on 2.0.18 because I had numerous problems getting it to make properly with 2.0.16) on FreeBSD 4.2 STABLE. I finally got the configure, make and make install to run smoothly without errors but when I try and start httpd, I get the error "undefined symbol: "pthread_getspecific" " (if I take out the "load_module" line in httpd.conf it runs fine.) I configured --with-apxs2 and --with-mysql options only ... (both with absolute paths supplied.) I suspect it is to do with linking the correct libraries but I am not sure and don't know how to link the libraries ? If I run ld on libphp4.so, I get a long list of undefined symbols (of which"pthread_getspecific" is one . I notice that most them are on the system in lib_c, can anyone offer any advice ? I have installed the latest autoconf, automake and libtools in my vain effort to cure the problem. If any one can shed any light on the problem I shall be extremely grateful.... Thanks in advance !