make Idea aware ant has already built the project in debug

Can I make Idea aware that my clasess are already built (after I use my build scripts) and not have Idea recompile everything? There must be a work directory or something that I could preserve - to trick Idea. Even at this moment, I am waiting for Idea to rebuild my project even though I got a clean CVS then used ant to build to my output directory in debug first before starting Idea.

thanks
Mike.