Add cyrus-sasl-xoauth2 from http://mmogilvi.users.sourceforge.net/software/oauthbearer.html

dev-libs/cyrus-sasl-xoauth2/Manifest

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+DIST cyrus-sasl-xoauth2-0.2.tar.gz 14120 BLAKE2B 21daeed883017029be37a7ac7397426a30a01ba9de7ff55d1bb403f0c266d0d90ef2b071653a355faba0d56d14a8e5bcc47d3c0780eb2401464e57d5fb7ad5ae SHA512 c3a8fdc7c51a22df9fd8da5418a95e146b46c6865d4990dcf4053f18ca9ee9900b3b564e85cc8ec7bcde75966385b148e8320059b00f2f1374d4601c50e2c821
+EBUILD cyrus-sasl-xoauth2-0.2.ebuild 1493 BLAKE2B 5e2f7acc1b123784b361c3fbc28b88d8c03ebf931163e07b033efdf4c235eca65b0df4fed5f7bc0bb47fee51b5ae06adb92289e70811648e28f1cd3eea844e89 SHA512 ce76ae4bef60d45952983a61bdb8c18da0a15b615e782d43d929ce0b9fdcb701a96fa0985ad5c12133585f38ebad0b3cd17475910463ccc187e21c5436b3ef3a

dev-libs/cyrus-sasl-xoauth2/cyrus-sasl-xoauth2-0.2.ebuild

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+# Copyright 1999-2017 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+
+inherit autotools eutils multilib multilib-minimal
+
+DESCRIPTION="xoauth2 plugin for cyrus-sasl"
+HOMEPAGE="https://github.com/moriyoshi/cyrus-sasl-xoauth2"
+SRC_URI="https://github.com/moriyoshi/${PN}/archive/v${PV}.tar.gz -> ${P}.tar.gz"
+
+# License wraps lines differently and doesn't have last paragraph
+# in square brackets about advertising.  But otherwise the license
+# wording is identical to MIT:
+LICENSE="MIT"
+
+SLOT="0"
+KEYWORDS="amd64 ~x86"
+
+RDEPEND="dev-libs/cyrus-sasl"
+DEPEND="${RDEPEND}"
+
+src_prepare() {
+	# FUTURE: It would probably be better to make this a properly-named
+	#  "configure"-able variable, and invoke configure with something like
+	#     --with-plugindir="${EPREFIX}/usr/$(get_libdir)/sasl2"
+	sed -i -e 's%^pkglibdir =.*/lib/%pkglibdir = @libdir@/%' Makefile.am
+
+	default
+
+	eautoreconf
+}
+
+multilib_src_configure() {
+	ECONF_SOURCE=${S} \
+	econf \
+		--with-cyrus-sasl="${EPREFIX}/usr" \
+		--disable-static
+}
+
+multilib_src_install() {
+	default
+
+	# Adapted from similar in cyrus-sasl ebuild; removed static-libs check
+	# FUTURE: Would it be useful to add a static-libs use
+	#   flag and prefix this with "use static-libs ||"?  It isn't
+	#   clear that that would be useful for anything; things using
+	#   sasl would probably have to explicitly statically link
+	#   this specific plugin.
+	[[ $(get_modname) != .so ]] || \
+		prune_libtool_files --modules
+}