pgsql+apache module

Hi, I've got PHP4/Apache set up on Debian. Whenever I enable pgsql.so in my php.ini, Apache won't serve me html pages anymore. It serves pdf files fine, but html and php stuff doesn't work. In my apache error log file I get "Child process XXXX died from segmentation fault" or something like that. This goes away when I disable the pgsql.so, but then the pg_* functions are disabled, obviously. I checked for the pthreads thing mentioned in the FAQ for MySQL, but pgsql is not linked against libpthreads. It is linked against my libc, though, which is 2.2. Any ideas? Thanks, Andy MacNamara