# Using ocamlp-streams instead of Stdlib.streams **URL:** \ **Category:** Learning\ **Created:** [December 27, 2025, 9:13pm UTC](https://discuss.ocaml.org/t/using-ocamlp-streams-instead-of-stdlib-streams/17641 "2025-12-27T21:13:21Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![ratschan](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/ratschan/32/6334_2.png) [@ratschan](https://discuss.ocaml.org/u/ratschan)\ **Post date:** [December 27, 2025, 9:13pm UTC](https://discuss.ocaml.org/t/using-ocamlp-streams-instead-of-stdlib-streams/17641/1 "2025-12-27T21:13:21Z")
Many years ago, I wrote a simple script using the Stdlib streams library. When trying to compile it nowadays, I get the message: Alert deprecated: module Stdlib.Stream Use the camlp-streams library instead. So I installed the camlp-streams library, and told ocamlc to use it: ocamlc -I +camlp-streams camlp\_streams.cma x.ml However, I still get the very same error message about Stdlib.streams being deprecated. So how do I teach ocamlc to use camlp\_streams and not Stdlib.streams? ---
**Author:** ![dbuenzli](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/dbuenzli/32/18_2.png) [@dbuenzli](https://discuss.ocaml.org/u/dbuenzli)\ **Post date:** [December 27, 2025, 9:24pm UTC](https://discuss.ocaml.org/t/using-ocamlp-streams-instead-of-stdlib-streams/17641/2 "2025-12-27T21:24:00Z")
Try something like: ```auto ocamlfind ocamlc -g -linkpkg camlp-streams x.ml ``` ---
**Author:** ![nojb](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/nojb/32/519_2.png) [@nojb](https://discuss.ocaml.org/u/nojb)\ **Post date:** [December 28, 2025, 5:44am UTC](https://discuss.ocaml.org/t/using-ocamlp-streams-instead-of-stdlib-streams/17641/3 "2025-12-28T05:44:54Z")
> [@ratschan](#): > > ocamlc -I +camlp-streams camlp\_streams.cma x.ml > > However, I still get the very same error message about Stdlib.streams being deprecated. If you installed `camlp-streams` using OPAM, it is not installed in the compiler directory but in the OPAM package directory, so the include directory to pass using `-I` is not `+camlp-streams` but one under your OPAM switch, eg: ```auto ocamlc -I $(opam var camlp-streams:lib) camlp_streams.cma x.ml ``` > [@dbuenzli](#): > > Try something like: > > ```auto > ocamlfind ocamlc -g -linkpkg camlp-streams x.ml > > ``` I think a `-package` flag is missing: ```auto ocamlfind ocamlc -g -linkpkg -package camlp-streams x.ml ``` Cheers, Nicolas ---
**Author:** ![ratschan](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/ratschan/32/6334_2.png) [@ratschan](https://discuss.ocaml.org/u/ratschan)\ **Post date:** [December 28, 2025, 10:20am UTC](https://discuss.ocaml.org/t/using-ocamlp-streams-instead-of-stdlib-streams/17641/4 "2025-12-28T10:20:07Z")
Thanks a lot for answering! The suggestion ocamlfind ocamlc -g -linkpkg -package camlp-streams x.ml seems to fit my setup, but the result is still the same (Alert deprecated: module Stdlib.Stream. Use the camlp-streams library instead) I do not use opam, but the Ubuntu package libcamlp-streams-ocaml. Therefore the camlp\_streams library is in /usr/lib/ocaml/camlp-streams/camlp\_streams.cma To sum up, I tried ocamlfind ocamlc -g -linkpkg -package camlp-streams x.ml ocamlc -I +camlp-streams camlp\_streams.cma x.ml ocamlc -I /usr/lib/ocaml/camlp-streams camlp\_streams.cma x.ml and get the same error for all of them. ---
**Author:** ![dbuenzli](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/dbuenzli/32/18_2.png) [@dbuenzli](https://discuss.ocaml.org/u/dbuenzli)\ **Post date:** [December 28, 2025, 10:54am UTC](https://discuss.ocaml.org/t/using-ocamlp-streams-instead-of-stdlib-streams/17641/5 "2025-12-28T10:54:04Z")
Can you perhaps show a minimal `x.ml` that exhibits the problem? ---
**Author:** ![dbuenzli](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/dbuenzli/32/18_2.png) [@dbuenzli](https://discuss.ocaml.org/u/dbuenzli)\ **Post date:** [December 28, 2025, 11:21am UTC](https://discuss.ocaml.org/t/using-ocamlp-streams-instead-of-stdlib-streams/17641/6 "2025-12-28T11:21:58Z")
Also the various exact versions of the compiler and library you are using. It seems work was done at some point for [“exporting without deprecation”](https://github.com/ocaml/camlp-streams/commit/9498a2c969c83a4df98dfdee8581b10f401e973c) perhaps you don’t have that commit. ---
**Author:** ![ratschan](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/ratschan/32/6334_2.png) [@ratschan](https://discuss.ocaml.org/u/ratschan)\ **Post date:** [December 28, 2025, 2:07pm UTC](https://discuss.ocaml.org/t/using-ocamlp-streams-instead-of-stdlib-streams/17641/7 "2025-12-28T14:07:15Z")
let main = let c= Stream.of\_channel stdin in 0 already results in the error message. ocamlc -v gives: The OCaml compiler, version 4.14.1 Standard library directory: /usr/lib/ocaml on Ubuntu 24.04.3 LTS Package: libcamlp-streams-ocaml Version: 5.0.1-3build3 ---
**Author:** ![dbuenzli](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/dbuenzli/32/18_2.png) [@dbuenzli](https://discuss.ocaml.org/u/dbuenzli)\ **Post date:** [December 28, 2025, 2:26pm UTC](https://discuss.ocaml.org/t/using-ocamlp-streams-instead-of-stdlib-streams/17641/8 "2025-12-28T14:26:48Z")
I can’t reproduce with OCaml 4.14.2 and opam’s `camlp-streams`: ```sh > ocaml --version The OCaml toplevel, version 4.14.2 > opam info -f version camlp-streams 5.0.1 > cat x.ml let () = let c = Stream.of_channel in ignore (c) > ocamlfind ocamlc x.ml File "x.ml", line 2, characters 10-27: 2 | let c = Stream.of_channel in ^^^^^^^^^^^^^^^^^ Alert deprecated: module Stdlib.Stream Use the camlp-streams library instead. > ocamlfind ocamlc -linkpkg -package camlp-streams x.ml > ``` (My gut feeling would be that there is something wrong with the system camlp-streams install) ---
**Author:** ![ratschan](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/ratschan/32/6334_2.png) [@ratschan](https://discuss.ocaml.org/u/ratschan)\ **Post date:** [December 28, 2025, 3:05pm UTC](https://discuss.ocaml.org/t/using-ocamlp-streams-instead-of-stdlib-streams/17641/9 "2025-12-28T15:05:49Z")
In the meanwhile, I tried to compile with ocamlopt, which works and solves my problem. Thanks a lot for you help!