How do I force Xcode to rebuild the Info.plist file in my project every time I build the project?

Apparently the file gets cached, so it only gets built when it gets changed. I have environment variables set to increment my version number though, and such, and update them independently of the plist (in the project build settings, actually). Is there a script that I can use as a script build phase that will force the Info.plist to update? Some other convenient way?