# \[Dream\] my first try **URL:** \ **Category:** Learning\ **Tags:** dream\ **Created:** [December 9, 2024, 10:07pm UTC](https://discuss.ocaml.org/t/dream-my-first-try/15773 "2024-12-09T22:07:32Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![NAlec](https://avatars.discourse-cdn.com/v4/letter/n/91b2a8/32.png) [@NAlec](https://discuss.ocaml.org/u/NAlec)\ **Post date:** [December 9, 2024, 10:07pm UTC](https://discuss.ocaml.org/t/dream-my-first-try/15773/1 "2024-12-09T22:07:33Z")
I am willing to test the Dream webframework for a small project. Installing it took me some time because of the recent ssl dependency issue. Then I am trying to reproduce the 01-hello tutorial by copy/paste the source code in a project I build myself. I have a linking error I don’t know how to resolve (@antron ). Help appreciated. My ocaml setup is on a windows box. ```auto opam exec -- dune init project test_dream ``` I modify the dune file: ```auto (executable (public_name test_dream) (name main) (libraries test_dream dream)) ``` copy / paste the source code into main.ml ```auto let () = Dream.run (fun _ -> Dream.html "Good morning, world!") ``` and build ```auto PS H:\OCaml\test_dream> (& opam env) -split '\r?\n' | ForEach-Object { Invoke-Expression $_ } PS H:\OCaml\test_dream> opam exec -- dune build File "bin/dune", line 3, characters 7-11: 3 | (name main) ^^^^ /bin/bash: C:UsersNAlec~1AppDataLocalTempbuild_967b29_dunelongcmd8d30f6: No folder or file of this type ** Fatal error: Error during linking File "caml_startup", line 1: Error: Error during linking (exit code 2) PS H:\OCaml\test_dream> ``` If it were necessary : ```auto PS H:\OCaml\test_dream> opam show dream <><> dream: information on all versions <><><><><><><><><><><><><><><><><><> 🐫 name dream all-installed-versions 1.0.0~alpha7 [default] all-versions 1.0.0~alpha1 1.0.0~alpha2 1.0.0~alpha3 1.0.0~alpha4 1.0.0~alpha5 1.0.0~alpha6 1.0.0~alpha7 <><> Version-specific details <><><><><><><><><><><><><><><><><><><><><><><> 🐫 version 1.0.0~alpha7 repository default url.src "https://github.com/aantron/dream/releases/download/1.0.0-alpha7/dream-1.0.0-alpha7.tar.gz" url.checksum "sha256=b715cecf7e2b249335c8d1cd22c3e87017e40c0556774d209f338f9d78388c86" homepage "https://github.com/aantron/dream" doc "https://aantron.github.io/dream" bug-reports "https://github.com/aantron/dream/issues" dev-repo "git+https://github.com/aantron/dream.git" authors "Anton Bachin " maintainer "Anton Bachin " license "MIT" tags "http" "web" "framework" "websocket" "graphql" "server" "http2" "tls" depends "base-unix" "bigarray-compat" "camlp-streams" "caqti" {>= "2.0.0"} "caqti-lwt" {>= "2.0.0"} ("conf-libev" {os != "win32"} | "ocaml" {os = "win32"}) "cstruct" {>= "6.0.0"} "digestif" {>= "0.7"} "dream-httpaf" {>= "1.0.0~alpha3"} "dream-pure" {>= "1.0.0~alpha2"} "dune" {>= "2.7.0"} "fmt" {>= "0.8.7"} "graphql_parser" "graphql-lwt" "lambdasoup" {>= "0.6.1"} "lwt" "lwt_ppx" {>= "1.2.2"} "lwt_ssl" "logs" {>= "0.5.0"} "magic-mime" "markup" {>= "1.0.2"} "mirage-clock" {>= "3.0.0"} "mirage-crypto" {>= "1.0.0"} "mirage-crypto-rng" {>= "1.0.0"} "mirage-crypto-rng-lwt" "multipart_form" {>= "0.4.0"} "multipart_form-lwt" "ocaml" {>= "4.08.0"} "ptime" {>= "0.8.1"} "ssl" {>= "0.5.8"} "uri" {>= "4.2.0"} "yojson" "alcotest" {with-test} "bisect_ppx" {with-test & >= "2.5.0"} "caqti-driver-postgresql" {with-test} "caqti-driver-sqlite3" {with-test} "crunch" {with-test} "html_of_jsx" {with-test} "js_of_ocaml" {with-test} "js_of_ocaml-ppx" {with-test} "ppx_expect" {with-test & >= "v0.15.0"} "ppx_yojson_conv" {with-test} "reason" {with-test} "tyxml" {with-test & >= "4.5.0"} "tyxml-jsx" {with-test} ``` ---
**Author:** ![yawaramin](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/yawaramin/32/3384_2.png) [@yawaramin](https://discuss.ocaml.org/u/yawaramin)\ **Post date:** [December 9, 2024, 10:43pm UTC](https://discuss.ocaml.org/t/dream-my-first-try/15773/2 "2024-12-09T22:43:37Z")
> [@NAlec](#): > > ` (libraries test_dream dream))` `test_dream` is not needed here. It’s the name of your project and the public name of your executable. The `libraries` field lists the _dependency_ libraries. Your executable is not depending on itself. Try copying and running _exactly_ the 1-hello example as shown in the Dream repo: [dream/example/1-hello at master · aantron/dream · GitHub](https://github.com/aantron/dream/tree/master/example/1-hello) It is designed to be a complete, self-contained project. You don’t need to initialize a new project with `dune init project`. Just try running the project in the above directory. Follow the instructions in the readme shown in my link. ---
**Author:** ![NAlec](https://avatars.discourse-cdn.com/v4/letter/n/91b2a8/32.png) [@NAlec](https://discuss.ocaml.org/u/NAlec)\ **Post date:** [December 10, 2024, 10:07pm UTC](https://discuss.ocaml.org/t/dream-my-first-try/15773/3 "2024-12-10T22:07:45Z")
I have copied the exact 1-hello example and build it with the same error. The `test_dream` in the `libraries` is added by dune at initialisation of projects and I don’t think this is the issue. ```auto PS H:\OCaml\test_dream> opam exec -- dune build File "dune", line 2, characters 7-12: 2 | (name hello) ^^^^^ /bin/bash: C:UsersNAlecAppDataLocalTempbuild_71f7d1_dunelongcmd9f3bd8: Aucun fichier ou dossier de ce type ** Fatal error: Error during linking File "caml_startup", line 1: Error: Error during linking (exit code 2) PS H:\OCaml\test_dream> ``` ---
**Author:** ![yawaramin](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/yawaramin/32/3384_2.png) [@yawaramin](https://discuss.ocaml.org/u/yawaramin)\ **Post date:** [December 10, 2024, 11:06pm UTC](https://discuss.ocaml.org/t/dream-my-first-try/15773/4 "2024-12-10T23:06:57Z")
> [@NAlec](#): > > `C:UsersNAlecAppDataLocalTempbuild_71f7d1_dunelongcmd9f3bd8: Aucun fichier ou dossier de ce type` Looks like all the backslash characters have been dropped. Maybe some part of your system is mixing up file paths. I think this is an issue where we would need to know how exactly you installed OCaml/opam, which shell you are using (cmd.exe? PowerShell?), and so on. Looks like the OCaml installation itself has an issue. ---
**Author:** ![jaycle](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/jaycle/32/4161_2.png) [@jaycle](https://discuss.ocaml.org/u/jaycle)\ **Post date:** [December 12, 2024, 5:15am UTC](https://discuss.ocaml.org/t/dream-my-first-try/15773/5 "2024-12-12T05:15:08Z")
You may be experiencing what is covered in [this thread](https://discuss.ocaml.org/t/dunelongcmd-linking-error-on-windows-using-ocamlopt/15469/4). ---
**Author:** ![NAlec](https://avatars.discourse-cdn.com/v4/letter/n/91b2a8/32.png) [@NAlec](https://discuss.ocaml.org/u/NAlec)\ **Post date:** [December 13, 2024, 3:21pm UTC](https://discuss.ocaml.org/t/dream-my-first-try/15773/6 "2024-12-13T15:21:38Z")
Indeed ! Using @b-valdez trick solved the issue for me. I had WSL installed as well.