Please select DEVPTS_MULTIPLE_INSTANCES when GENTOO_LINUX_INIT_SYSTEMD is selected. I just added CONFIG_CHECK for this; it is required for systemd-localed to start properly. The problem is not severe enough to warrant a special gentoo-sources release.
This is queued up for all of the next gentoo-sources release which right now include: 3.19,3.18,3.17,3.14,3.10 and 3.4.