Fatal error loading extension

Hi, I have managed (with some struggle) to compile an extension for PHP. I tried to open a test page, loading the extension wit the dl command, and this is what I get: Fatal error: Unable to load dynamic library '/opt/gislab/php/extensions/php_mapscript.so' - ld.so.1: /opt/gislab/apache/bin/httpd: fatal: /opt/gislab/php/extensions/php_mapscript.so: required mapping 0x10000 size 0x82000, is already in use by file /opt/gislab/apache/bin/httpd in /opt/gislab/apache/htdocs/php/phpinfo_mapscript.php3 on line 21 ...any suggestions as to how to resolve this ? Thanks, Andrea