--- /usr/portage/sci-calculators/orpie/orpie-1.5.1-r1.ebuild	2015-08-09 22:34:53.000000000 +0200
+++ orpie-1.5.1-r1.ebuild	2015-11-20 08:43:02.902834875 +0100
@@ -15,7 +15,8 @@
 IUSE="doc"
 
 DEPEND="dev-ml/ocamlgsl
-	sys-libs/ncurses"
+	sys-libs/ncurses
+	|| ( <dev-lang/ocaml-4.02 dev-ml/camlp4 )"
 RDEPEND="${DEPEND}"
 
 src_prepare() {