I am trying to install the library tezos-crypto using Opam on Kubuntu 20.04. I am getting the following error:
<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
[ERROR] The compilation of tezos-stdlib-unix failed at "/home/marc/.opam/opam-init/hooks/sandbox.sh build dune build -p
tezos-stdlib-unix -j 15".
#=== ERROR while compiling tezos-stdlib-unix.10.2 =============================#
# context 2.0.5 | linux/x86_64 | ocaml-base-compiler.4.11.1 | https://opam.ocaml.org#e0171a79
# path ~/.opam/default/.opam-switch/build/tezos-stdlib-unix.10.2
# command ~/.opam/opam-init/hooks/sandbox.sh build dune build -p tezos-stdlib-unix -j 15
# exit-code 1
# env-file ~/.opam/log/tezos-stdlib-unix-69301-e0ba4f.env
# output-file ~/.opam/log/tezos-stdlib-unix-69301-e0ba4f.out
### output ###
# [...]
# (cd _build/default && /home/marc/.opam/default/bin/ocamlc.opt -w -40 -open Tezos_error_monad -open Tezos_error_monad.TzLwtreslib -open Tezos_event_logging -open Tezos_stdlib -open Data_encoding -g -bin-annot -I src/lib_stdlib_unix/.tezos_stdlib_unix.objs/byte -I /home/marc/.opam/default/lib/angstrom -I /home/marc/.opam/default/lib/astring -I /home/marc/.opam/default/lib/base -I /home/marc/.op[...]
# File "src/lib_stdlib_unix/file_descriptor_sink.ml", line 116, characters 16-24:
# 116 | Fmt.strf "%s-%d%s" chopped (Unix.getpid ()) ext
# ^^^^^^^^
# Alert deprecated: Fmt.strf
# use Fmt.str instead.
# (cd _build/default && /home/marc/.opam/default/bin/ocamlopt.opt -w -40 -open Tezos_error_monad -open Tezos_error_monad.TzLwtreslib -open Tezos_event_logging -open Tezos_stdlib -open Data_encoding -g -I src/lib_stdlib_unix/.tezos_stdlib_unix.objs/byte -I src/lib_stdlib_unix/.tezos_stdlib_unix.objs/native -I /home/marc/.opam/default/lib/angstrom -I /home/marc/.opam/default/lib/astring -I /home/[...]
# File "src/lib_stdlib_unix/file_descriptor_sink.ml", line 116, characters 16-24:
# 116 | Fmt.strf "%s-%d%s" chopped (Unix.getpid ()) ext
# ^^^^^^^^
# Alert deprecated: Fmt.strf
# use Fmt.str instead.
<><> Error report <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
┌─ The following actions failed
│ λ build tezos-stdlib-unix 10.2
└─
╶─ No changes have been performed