Using google apps openID on a site (not market place)

I am working on a site an want to use google apps openid as the target audience will all have open id 开发者_开发百科from google apps; however I am having trouble installing the php-openid-apps-discovery add on. I'm no dead set on using a php library but thats what have been trying so far. My question is if anyone knows of any good tutorials or alternate libraries that support google apps openid.

ps: google has not been very useful so far

Any OpenID library will work with Google's implementation of OpenID. Take your pick:

http://wiki.openid.net/w/page/12995176/Libraries