Interesting, eventually somebody gave me a detailed and technical explanation without [bla bla snip]. Thanks Rémi. Yes, I agree with you that the best (and the one I would go for, too) solution is adding support to a new *DEPEND, perhaps one that could "host" build-deps only. It looks weird that other PMs out there do that since 1994 (replace 1994 with older value). Perhaps adding a big fat # XXX somewhere in ebuilds would have helped us all in saving some time today. So, at least for now, I suspect I have to give up and close my shiny 27 bugs. Right?
-- Fabio Erculiani http://www.sabayon.org http://www.gentoo.org