I've seen that .bashrc ( /opt/x86-chroot/root/.bashrc ) lacks of "source /etc/profile" command (necessary to update environment variables). So i suggest to add the following line: echo "source /etc/profile" >> "${WORKDIR}/${CHROOT_LOCATION}/root/.bashrc" after the line echo "env-update" >> "${WORKDIR}/${CHROOT_LOCATION}/root/.bashrc" in the ebuild.
fixed, thanks for the catch