--- /usr/portage/sys-fs/udisks/udisks-2.6.5.ebuild	2017-05-19 15:46:07.227528567 +0200
+++ udisks-2.6.5-r2.ebuild	2017-05-27 11:51:01.687196779 +0200
@@ -11,7 +11,9 @@
 LICENSE="GPL-2"
 SLOT="2"
 KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~ia64 ~mips ~ppc ~ppc64 ~sh ~sparc ~x86"
-IUSE="acl cryptsetup debug +gptfdisk +introspection lvm nls selinux systemd"
+IUSE="acl cryptsetup elogind debug +gptfdisk +introspection lvm nls selinux systemd"
+
+REQUIRED_USE="?? ( elogind systemd )"
 
 COMMON_DEPEND="
 	>=dev-libs/glib-2.36:2
@@ -22,6 +24,7 @@
 	acl? ( virtual/acl )
 	introspection? ( >=dev-libs/gobject-introspection-1.30:= )
 	lvm? ( sys-fs/lvm2 )
+	elogind? ( sys-auth/elogind )
 	systemd? ( >=sys-apps/systemd-209 )
 "
 # gptfdisk -> src/udiskslinuxpartition.c -> sgdisk (see also #412801#c1)