According to <URL:http://www.gnu.org/licenses/license-list.html#SGIFreeB>, license “SGI-B-2.0” is compatible to the GPL. This should be reflected in ${PORTDIR}/profiles/license_groups in group GPL-COMPATIBLE.
betelgeuse@pena /usr/portage/profiles $ cvs commit -m "Add SGI-B-2.0 to GPG-compatible. See bug #292685." license_groups /var/cvsroot/gentoo-x86/profiles/license_groups,v <-- license_groups new revision: 1.16; previous revision: 1.15