$ jbuilder build --dev @install
      ocamlc lib/.CFStream.objs/CFStream__CFStream_stream.{cmo,cmt} (exit 2) ...
 -c -impl lib/CFStream_stream.ml)
File "lib/CFStream_stream.ml", line 70, characters 16-30:
Error: Unbound constructor Caml.Not_found

$ make
...
ocamlbuild -use-ocamlfind -plugin-tag "package(solvuu-build)" ./cfstream.cma
Finished, 0 targets (0 cached) in 00:00:00.
+ ocamlfind ocamlc -annot -bin-annot -c -g -I lib -o lib/CFStream_stream.cmo -short-paths -strict-sequence -thread -w A-4-33-41-42-44-45-48 -package core_kernel lib/CFStream_stream.ml
File "lib/CFStream_stream.ml", line 496, characters 18-22:
Warning 6: label f was omitted in the application of this function.
File "lib/CFStream_stream.ml", line 521, characters 2-8:
Warning 6: label f was omitted in the application of this function.
File "lib/CFStream_stream.ml", line 550, characters 32-52:
Warning 3: deprecated: Core_kernel.Std.Hashtbl.Poly.replace
[since 2015-10] Use set instead
File "lib/CFStream_stream.ml", line 623, characters 6-21:
Warning 6: label f was omitted in the application of this function.
File "lib/CFStream_stream.ml", line 631, characters 6-21:
Warning 6: label f was omitted in the application of this function.
File "lib/CFStream_stream.ml", line 61, characters 11-12:
Warning 27: unused variable x.
File "lib/CFStream_stream.ml", line 524, characters 11-12:
Warning 27: unused variable i.
Finished, 7 targets (0 cached) in 00:00:03.
rm -f cfstream.cma
ocamlbuild -use-ocamlfind -plugin-tag "package(solvuu-build)" app/cfstream-test.byte
Finished, 0 targets (0 cached) in 00:00:00.
+ ocamlfind ocamlc -annot -bin-annot -g -I lib -o app/cfstream-test.byte -short-paths -strict-sequence -thread -w A-4-33-41-42-44-45-48 -package core_kernel,oUnit -linkpkg ./cfstream.cma app/cfstream_test.ml
File "app/cfstream_test.ml", line 6, characters 51-59:
Warning 6: label f was omitted in the application of this function.
File "app/cfstream_test.ml", line 99, characters 22-26:
Warning 6: label n was omitted in the application of this function.
File "app/cfstream_test.ml", line 105, characters 22-26:
Warning 6: label n was omitted in the application of this function.
File "app/cfstream_test.ml", line 139, characters 10-14:
Warning 6: label f was omitted in the application of this function.
File "app/cfstream_test.ml", line 153, characters 10-20:
Warning 6: label f was omitted in the application of this function.
Finished, 8 targets (7 cached) in 00:00:01.

File "test_stream.ml", line 172, characters 35-37:
Warning 3: deprecated: Core_kernel.Std.|!
[since 2016-07] Use [ |> ]