Opam error: Invalid_argument("OpamEnv.unzip_to")

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1

Since the last few days, I get the following error message when trying to install opam packages:

[pkl@zeta ~]$ opam install merlin tuareg
The following actions will be performed:
  ∗ install merlin-lib        4.13-501 [required by merlin]
  ∗ install conf-emacs        1        [required by tuareg]
  ∗ install dot-merlin-reader 4.9      [required by merlin]
  ∗ install merlin            4.13-501
  ∗ install tuareg            3.0.1
===== ∗ 5 =====
Do you want to continue? [Y/n] y
Fatal error:
Invalid_argument("OpamEnv.unzip_to")
[pkl@zeta ~]$ opam --version
2.1.3
2

This happened to me but I was able to partially recover (my old switch still does not work) by recreating the opam env settings for my default switch:

OPAM_SWITCH_PREFIX='~/.opam/default'; export OPAM_SWITCH_PREFIX;
OCAML_TOPLEVEL_PATH='~/.opam/default/lib/toplevel'; export OCAML_TOPLEVEL_PATH;
CAML_LD_LIBRARY_PATH='~/.opam/default/lib/stublibs:/usr/local/lib/ocaml/4.08.1/stublibs:/usr/lib/ocaml/stublibs'; export CAML_LD_LIBRARY_PATH;

(your CAML_LD_LIBRARY_PATH will depend on where your default ocaml install is, version number etc.)

Once I was in my default switch I created a new switch. The new switch is 5.1.1 and the old was 5.1.0 but I do not know if this has anything to do why the new switch works and the old switch doesn’t.

3

Unfortunately, this did not solve the problem. The problem could be caused by the conf-openblas opam package. I have filed an issue here: Invalid_argument("OpamEnv.unzip_to") opam error after installing conf-openblas · Issue #25194 · ocaml/opam-repository · GitHub