Rename feat to vendored_feat and let it depend on vendored_fix.

src/Fix.ml

+(* The library fix has been renamed vendored_fix so as to prevent Dune
+   from complaining about a conflict with a copy of fix that might be
+   installed on the user's system. *)
+
+(* As a result, the library is now accessible under the name Vendored_fix.
+   Because we do not want to pollute our sources with this name, we define the
+   module Fix as an alias for Vendored_fix. *)
+
+include Vendored_fix

src/dune

 (library
-  (name feat)
-  (public_name feat)
+  (name vendored_feat)
+  (public_name vendored_feat)
   (synopsis "Facilities for enumerating and sampling algebraic data types")
   (flags "-w" "A-44")
-  (libraries seq zarith fix)
+  (libraries seq zarith vendored_fix)
 )

feat.opam → vendored_feat.opam

-name: "feat"
+name: "vendored_feat"
 opam-version: "2.0"
 maintainer: "francois.pottier@inria.fr"
 authors: [