[gentoo-embedded] resetting /usr/<target>/ filesystem

[Christopher Harvey]

I've been using the <target>-emerge wrapper, and installed some 
 packages that worked out great. Now I want to try a different set of 
 packages. Is there a way to start over with a clean /usr/<target> 
 directory without asking crossdev to re-install everything?

 I'm wishing I had made a zip of the clean folder.

 thanks.