apache can't load php4.so

apache can't load php4.so

I have never encouted this situation before.I followed the installation instruction as official mannual said.And I have tested the installtion process in FC1 and FC2.But now on FC4 it failed.

After installed apache and php,I start the server.But

[root@localhost php-4.3.11]# /usr/local/apache2/bin/apachectl start
Syntax error on line 232 of /usr/local/apache2/conf/httpd.conf:
Cannot load /usr/local/apache2/modules/libphp4.so into server: /usr/local/apache2/modules/libphp4.so: cannot restore segment prot after reloc: Permission denied

how can I do?
SELinux ?
not sure.
I have not come across that problem in FC1 and FC2
so how can I fix it?