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"
+ 12 Aug 2013; Sergey Popov <pinkbyte@gentoo.org> qemu-user-0.12.2.ebuild, + qemu-user-1.0.ebuild, qemu-user-1.1.0.ebuild, qemu-user-1.1.0-r1.ebuild, + qemu-user-1.2.2.ebuild, qemu-user-1.4.0.ebuild, qemu-user-9999.ebuild: + Enable verbose build, wrt bug #444346. Thanks to Agostino Sarubbo for + discovering this issue