Index: opam-1.3.1/src/tools/opam_installer.ml
===================================================================
--- opam-1.3.1.orig/src/tools/opam_installer.ml
+++ opam-1.3.1/src/tools/opam_installer.ml
@@ -312,7 +312,7 @@ let options =
     let mandir = mk_dir mandir in
     let libdir = mk_dir libdir in
     let stubsdir = match mk_dir stubsdir, libdir with
-      | None, Some d -> Some OpamFilename.Op.(d / "stubslibs")
+      | None, Some d -> Some OpamFilename.Op.(d / "stublibs")
       | d, None | (Some _ as d), _ -> d
     in
     let topdir = match mk_dir topdir, libdir with