The proposed solution is in the tracker. If this is an autotools based package, and '--disable-silent-rules' doesn't work, you can try to add MAKEOPTS+=" V=1"
+ 22 Nov 2012; Rick Farina <zerochaos@gentoo.org> b43-fwcutter-015.ebuild, + b43-fwcutter-016.ebuild: + verbose build, closing bug #444358