diff --git a/sci-mathematics/alt-ergo/alt-ergo-1.30.ebuild b/sci-mathematics/alt-ergo/alt-ergo-1.30.ebuild
index 1b6ff79abed01..d88124561173c 100644
--- a/sci-mathematics/alt-ergo/alt-ergo-1.30.ebuild
+++ b/sci-mathematics/alt-ergo/alt-ergo-1.30.ebuild
@@ -12,9 +12,9 @@ SLOT="0"
 KEYWORDS="amd64"
 IUSE="examples gtk +ocamlopt"
 
-DEPEND=">=dev-lang/ocaml-3.12.1:=[ocamlopt?]
+DEPEND=">=dev-lang/ocaml-3.12.1:=[ocamlopt=]
 	dev-ml/zarith:=
-	gtk? ( >=dev-ml/lablgtk-2.14:2=[sourceview,ocamlopt?] )
+	gtk? ( >=dev-ml/lablgtk-2.14:2=[sourceview,ocamlopt=] )
 	dev-ml/camlzip:=
 	<=dev-ml/ocplib-simplex-0.3:="
 RDEPEND="${DEPEND}"
diff --git a/sci-mathematics/alt-ergo/alt-ergo-2.3.0.ebuild b/sci-mathematics/alt-ergo/alt-ergo-2.3.0.ebuild
index 046f3c9f04f80..bbe4688b7840e 100644
--- a/sci-mathematics/alt-ergo/alt-ergo-2.3.0.ebuild
+++ b/sci-mathematics/alt-ergo/alt-ergo-2.3.0.ebuild
@@ -12,9 +12,9 @@ SLOT="0"
 KEYWORDS="amd64"
 IUSE="examples gtk +ocamlopt"
 
-DEPEND=">=dev-lang/ocaml-4.09.0:=[ocamlopt?]
+DEPEND=">=dev-lang/ocaml-4.09.0:=[ocamlopt=]
 	dev-ml/zarith:=
-	dev-ml/lablgtk:2=[sourceview,ocamlopt?]
+	dev-ml/lablgtk:2=[sourceview,ocamlopt=]
 	dev-ml/camlzip
 	sci-mathematics/psmt2-frontend
 	>=dev-ml/ocplib-simplex-0.4:=