No optimiser

I get the following error in the logs when I try and load the zend optimiser: Failed loading /usr/local/Zend/lib/ZendOptimizer.so: ld.so.1: /usr/local/apache/bin/httpd: fatal: relocation error: file /usr/local/Zend/lib/ZendOptimizer.so: symbol zend_v_compile_files: referenced symbol not found I'm using the optimiser for sparc-soloris, and I downloaded php4 from the web site today. My configure string is: './configure' '--with-apxs=/usr/local/apache/bin/apxs' '--with-config-file-path=/usr/local/apache' '--with-mysql=/usr/local/mysql' '--enable-versioning' '--with-system-regex' '--disable-debug' Why?; what is zend_v_compile_files ? Thanks Sam