Apache2 redirect

There are a bunch of ways to do this. Usually what I would do is:

Create two separate vhosts - one for the www.homepage.com and one for homepage.com. Set up the www.homepage.com vhost like you normally would. Then the homepage.com vhost just needs to look like this:

 <virtualhost *:80="">ServerName homepage.com
    Redirect / http://www.homepage.com/</virtualhost> 

Here is the Documentation on the Redirect as mentioned above

http://httpd.apache.org/docs/2.2/mod/mod_alias.html

If you specify "Permanent", search engines are supposed to replace the URL they requested with the destination one.