[gentoo-catalyst] forcing a package to recompile

[Lanza Fabrizio]

Hi,
I am using catalyst for a livecd. When I reached livecd-stage1, one
package failed because it needs qt compiled with different USE flags.
I have all the autoresume, autochache, and whatever, set for catalyst.
I already put the correct USE flags in package.use, but basically I
cannot get qt recompiled. So, it always hangs at the same place.
 
Is there a way to tell catalyst that qt is not installed, so that it
will install it again? Or a way to force its reinstall? I could delete
it also from the temp snapshot... but what would I have to delete?
 
 Thank you.