--- /usr/portage/x11-misc/lightdm/lightdm-1.18.3-r1.ebuild	2018-04-13 01:26:39.050078735 -0300
+++ lightdm/lightdm-1.18.3-r1.ebuild	2018-04-26 21:58:10.920011676 -0300
@@ -2,7 +2,7 @@
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=6
-inherit autotools eutils flag-o-matic pam qmake-utils readme.gentoo-r1 systemd versionator xdg-utils
+inherit autotools eutils flag-o-matic pam qmake-utils readme.gentoo-r1 systemd versionator xdg-utils vala
 
 TRUNK_VERSION="$(get_version_component_range 1-2)"
 DESCRIPTION="A lightweight display manager"
@@ -13,7 +13,7 @@
 LICENSE="GPL-3 LGPL-3"
 SLOT="0"
 KEYWORDS="amd64 arm ~arm64 ppc ppc64 x86"
-IUSE="audit +introspection qt5 +gnome"
+IUSE="audit +introspection qt5 +gnome +vala"
 
 COMMON_DEPEND="audit? ( sys-process/audit )
 	>=dev-libs/glib-2.32.3:2
@@ -34,6 +34,7 @@
 	dev-util/gtk-doc-am
 	dev-util/intltool
 	gnome? ( gnome-base/gnome-common )
+	vala? ( $(vala_depend) )
 	sys-devel/gettext
 	virtual/pkgconfig"
 PDEPEND="x11-misc/lightdm-gtk-greeter"
@@ -65,6 +66,8 @@
 	else
 		AT_M4DIR=${WORKDIR} eautoreconf
 	fi
+
+	use vala && vala_src_prepare
 }
 
 src_configure() {
@@ -91,6 +94,7 @@
 		$(use_enable introspection) \
 		--disable-liblightdm-qt \
 		$(use_enable qt5 liblightdm-qt5) \
+		$(use_enable vala) \
 		--with-user-session=${_session} \
 		--with-greeter-session=${_greeter} \
 		--with-greeter-user=${_user} \