Thanks to arthurzam in bug 589644.
Package-Manager: portage-2.3.0
--- /dev/null
+# Copyright 1999-2016 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Id$
+
+EAPI=5
+
+DESCRIPTION="Virtual package for building against PoDoFo"
+HOMEPAGE=""
+SRC_URI=""
+
+LICENSE=""
+SLOT="0"
+KEYWORDS="~amd64 ~arm ~hppa ~ppc ~ppc64 ~sparc ~x86"
+IUSE="+boost idn debug test"
+
+# Pull in boost for build-against header dependency (see bug #503802).
+RDEPEND="
+ ~app-text/podofo-0.9.4[boost=,idn=,debug=,test=]
+ boost? ( dev-libs/boost )
+"
+DEPEND=""