PHP, Apache and threads: very strange

Hi, guys. I'm installing PHP 4.2.1 with Apache 2.0.36. I can compile both the way I've been doing for years, but this time when I start Apache I get the following error message: ================== Syntax error on line 230 of /usr/local/apache2/conf/httpd.conf: Cannot load /usr/local/apache2/modules/libphp4.so into server: /usr/local/apache2/modules/libphp4.so: Undefined symbol "pthread_getspecific" /apache/bin/apachectl start: httpd could not be started ================== httpd.conf, line 230 (automatically inserted during PHP build) is: LoadModule php4_module modules/libphp4.so PHP Configure command is: ./configure --with-apxs2=/usr/local/apache2/bin/apxs --enable-dbase --enable -ftp --with-mysql=/usr/local/mysql --with-pgsql=/usr/local/pgsql --enable-tr ans-sid --enable-sysvsem --enable-sysvshm --enable-wddx --enable-debug=no -- enable-safe-mode --with-imap=/usr/local/src/imap/client/imap-4.5 Apache Configure command is: ./configure --enable-module=so --enable-module=unique_id --with-perl=/usr/bi n/perl The OS is: FreeBSD 4.5-RELEASE Could anybody help me? Thanks in advance. Wagner. --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.361 / Virus Database: 199 - Release Date: 07/05/02