Your apache needs to have mod_so/apxs. You use apxs to compile the module then all you need to do is have apache load it (by adding LoadModule mod_layout.so in your httpd.conf). This is assuming you use linux.
Steven Ciaburri | Industry's Best Server Management- Rack911.com
Software Auditing - 400+ Vulnerabilities Found - Quote @ https://www.RACK911Labs.com Fully Managed Dedicated Servers (Las Vegas, New York City, & Amsterdam) (AS62710)
FreeBSD & Linux Server Management, Security Auditing, Server Optimization, PCI Compliance