samba ebuild (at least 3.0.5 checked) does not use gentoo's emake, leading to not being build in parallel: ... make everything ... replacing make with emake enables one to build samba MUCH faster on multi CPU machines (-j)
you're right. Fixed. BTW: If you have an arch beside sparc or x86, could you test the ebuild proposed in bug #58090?
fixed in samba-3.0.5-r1