# Error installing ocamlfind and dune using opam

**URL:** <https://discuss.ocaml.org/t/error-installing-ocamlfind-and-dune-using-opam/8305>\
**Category:** Learning\
**Tags:** opam, build, dune\
**Created:** [August 16, 2021, 12:55pm UTC](https://discuss.ocaml.org/t/error-installing-ocamlfind-and-dune-using-opam/8305 "2021-08-16T12:55:14Z")\
**Posts on this page:** 8\
**Page:** 1

<div class="post-metadata">

**Author:** ![isaacnonato](https://avatars.discourse-cdn.com/v4/letter/i/2bfe46/32.png) [@isaacnonato](https://discuss.ocaml.org/u/isaacnonato)\
**Post date:** [August 16, 2021, 12:55pm UTC](https://discuss.ocaml.org/t/error-installing-ocamlfind-and-dune-using-opam/8305/1 "2021-08-16T12:55:14Z")

</div>

I’m getting the following error when installing core using `opam install core` in openSUSE Leap 15.2:

```auto
<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
[ERROR] The compilation of dune failed at
        "/home/isaac/.opam/opam-init/hooks/sandbox.sh build ocaml bootstrap.ml -j
        7".
[ERROR] The compilation of ocamlfind failed at
        "/home/isaac/.opam/opam-init/hooks/sandbox.sh build make all".

#=== ERROR while compiling ocamlfind.1.9.1 ====================================#
# context 2.0.8 | linux/x86_64 | ocaml-system.4.12.0 | https://opam.ocaml.org#3e991263
# path ~/.opam/default/.opam-switch/build/ocamlfind.1.9.1
# command ~/.opam/opam-init/hooks/sandbox.sh build make all
# exit-code 2
# env-file ~/.opam/log/ocamlfind-10862-5e06f5.env
# output-file ~/.opam/log/ocamlfind-10862-5e06f5.out
### output ###
# [...]
# Use Bytes.create/BytesLabels.create instead.
# ocamlc -I +compiler-libs -o ocamlfind -g findlib.cma unix.cma \
# ocaml_args.cmo frontend.cmo
# ocamlc -I +compiler-libs -opaque -c topfind.mli
# ocamlc -I +compiler-libs -opaque -g -c topfind.ml
# File "topfind.ml", line 47, characters 4-25:
# 47 | Topdirs.dir_directory d;
# ^^^^^^^^^^^^^^^^^^^^^
# Error: Unbound module Topdirs
# make[1]: *** [Makefile:165: topfind.cmo] Error 2
# make[1]: Leaving directory '/home/isaac/.opam/default/.opam-switch/build/ocamlfind.1.9.1/src/findlib'
# make: *** [Makefile:14: all] Error 2

#=== ERROR while compiling dune.2.9.0 =========================================#
# context 2.0.8 | linux/x86_64 | ocaml-system.4.12.0 | https://opam.ocaml.org#3e991263
# path ~/.opam/default/.opam-switch/build/dune.2.9.0
# command ~/.opam/opam-init/hooks/sandbox.sh build ocaml bootstrap.ml -j 7
# exit-code 2
# env-file ~/.opam/log/dune-10862-c291cc.env
# output-file ~/.opam/log/dune-10862-c291cc.out
### output ###
# ocamlc -output-complete-exe -w -24 -g -o .duneboot.exe -I boot unix.cma boot/libs.ml boot/duneboot.ml
# gcc-7: error trying to exec 'cc1': execvp: No such file or directory
# File "boot/duneboot.ml", line 1:
# Error: Error while building custom runtime system

<><> Error report <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
┌─ The following actions failed
│ λ build dune 2.9.0
│ λ build ocamlfind 1.9.1
└─ 
╶─ No changes have been performed

```

GCC is installed and I checked that the cc1 file exists, how can I fix this?

---

<div class="post-metadata">

**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:** [August 16, 2021, 1:04pm UTC](https://discuss.ocaml.org/t/error-installing-ocamlfind-and-dune-using-opam/8305/2 "2021-08-16T13:04:58Z")

</div>

> [@isaacnonato](#):
>
> ```auto
> # ocamlc -I +compiler-libs -opaque -g -c topfind.ml
> # File "topfind.ml", line 47, characters 4-25:
> # 47 | Topdirs.dir_directory d;
> # ^^^^^^^^^^^^^^^^^^^^^
> # Error: Unbound module Topdirs
> 
> ```

This is a little bit strange but I see you are on a system switch which is always a bit more brittle.

Here are things that could go wrong:

1. Your system compiler doesn’t install compiler libs. Can you check that `ls $(ocamlc -where)/compiler-libs/topdir.*` returns result ?
2. Maybe the `opam` sandboxing doesn’t allow you to access `ocamlc -where/compiler-lib` ? I’m not up-to-date with the details of the `opam` sandboxing stuff, but I bet the `opam` devs got that right, so it seems unlikely.

If none of this brings any answer maybe the best is to use a non-system switch (something like `opam switch create 4.12.0 && opam install core`).

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<div class="post-metadata">

**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:** [August 16, 2021, 1:16pm UTC](https://discuss.ocaml.org/t/error-installing-ocamlfind-and-dune-using-opam/8305/3 "2021-08-16T13:16:18Z")

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> [@isaacnonato](#):
>
> ```auto
> # gcc-7: error trying to exec 'cc1': execvp: No such file or directory
> # File "boot/duneboot.ml", line 1:
> 
> ```

Actually I missed that. I really suspect some kind of sandboxing issue, it seems that some stuff cannot be found in the PATH.

---

<div class="post-metadata">

**Author:** ![isaacnonato](https://avatars.discourse-cdn.com/v4/letter/i/2bfe46/32.png) [@isaacnonato](https://discuss.ocaml.org/u/isaacnonato)\
**Post date:** [August 16, 2021, 1:16pm UTC](https://discuss.ocaml.org/t/error-installing-ocamlfind-and-dune-using-opam/8305/4 "2021-08-16T13:16:31Z")

</div>

Thanks for your answer. The compiler-libs folder does not exist.  
I tried a switch using `opam switch create ocaml-system.4.12.0 && opam install core` but the error still persists.

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<div class="post-metadata">

**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:** [August 16, 2021, 1:18pm UTC](https://discuss.ocaml.org/t/error-installing-ocamlfind-and-dune-using-opam/8305/5 "2021-08-16T13:18:14Z")

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Is it the same errors ?

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<div class="post-metadata">

**Author:** ![isaacnonato](https://avatars.discourse-cdn.com/v4/letter/i/2bfe46/32.png) [@isaacnonato](https://discuss.ocaml.org/u/isaacnonato)\
**Post date:** [August 16, 2021, 1:20pm UTC](https://discuss.ocaml.org/t/error-installing-ocamlfind-and-dune-using-opam/8305/6 "2021-08-16T13:20:29Z")

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Yes, the exact same errors.

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<div class="post-metadata">

**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:** [August 16, 2021, 1:24pm UTC](https://discuss.ocaml.org/t/error-installing-ocamlfind-and-dune-using-opam/8305/7 "2021-08-16T13:24:03Z")

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> [@isaacnonato](#):
>
> `opam switch create ocaml-system.4.12.0 && opam install core` but the error still persists.

Ah but you likely created a system switch… this should be `ocaml.4.12.0` or `ocaml-base-compiler.4.12.0` maybe, checkout `opam switch list`.

---

<div class="post-metadata">

**Author:** ![isaacnonato](https://avatars.discourse-cdn.com/v4/letter/i/2bfe46/32.png) [@isaacnonato](https://discuss.ocaml.org/u/isaacnonato)\
**Post date:** [August 16, 2021, 2:39pm UTC](https://discuss.ocaml.org/t/error-installing-ocamlfind-and-dune-using-opam/8305/8 "2021-08-16T14:39:45Z")

</div>

I created a switch correctly and it worked, thanks for your help.