Fix dependencies

Author: Halbaroth

packages/ancient/ancient.0.10.0/opam

@@ -22,8 +22,7 @@ homepage: "https://github.com/OCamlPro/ocaml-ancient"
 bug-reports: "https://github.com/OCamlPro/ocaml-ancient/issues"
 depends: [
   "dune" {>= "3.0"}
-  "ocaml" {>= "4.12"}
-  "base-nnp"
+  (("ocaml" {< "5"} & "ocaml-option-nnp") | "ocaml" {>= "5"})
   "odoc" {with-doc}
 ]
 build: [