I have included the --disable-multilib manually in the boostrap  
script and now everything works fine :-).

I.e. almost everything. The script bootstraps portage to $PREFIX/usr/ 
portage-alt-prefix, which portage does not know about. I added a  
symlink portage->portage-alt-prefix to fix this. And for some reason,  
the bootstrap script sets up the symlink for curl, but does not add  
FETCHCOMMAND and RESUMECOMMAND to make.conf.

BTW, I think it's not sufficient to add --disable-multilib to the  
bootstrap script, the gcc-apple ebuild needs to be fixed, too. I've  
also done this manually right now.

Tobias
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