--- /usr/portage/sci-geosciences/osm2pgsql/osm2pgsql-99999999.ebuild	2012-05-24 18:31:25.000000000 +0200
+++ sci-geosciences/osm2pgsql/osm2pgsql-99999999.ebuild	2012-06-03 22:45:31.526855113 +0200
@@ -16,7 +16,7 @@
 LICENSE="GPL-2"
 SLOT="0"
 KEYWORDS=""
-IUSE=""
+IUSE="+pbf"
 
 DEPEND="
 	app-arch/bzip2
@@ -25,6 +25,7 @@
 	sci-libs/proj
 	sys-libs/zlib
 	dev-db/postgresql-base
+	pbf? ( dev-libs/protobuf-c )
 "
 RDEPEND="${DEPEND}"