fswatch_lwt 11-0.1.0

Error log

The package failed to build. The error log from opam follows.

Opam plugin "depext" may require upgrading/reinstalling. Reinstall the plugin on the current switch? [Y/n] y
The following actions will be performed:
  - recompile opam-depext 1.2.1-1

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
-> retrieved opam-depext.1.2.1-1  (cached)
-> removed   opam-depext.1.2.1-1
-> installed opam-depext.1.2.1-1
Done.

<><> opam-depext.1.2.1-1 installed successfully <><><><><><><><><><><><><><><><>
=> opam-depext is unnecessary when used with opam >= 2.1. Please use opam install directly instead
# Run eval $(opam env) to update the current shell environment

<><> Carrying on to "opam depext -viy fswatch_lwt.11-0.1.0 ocplib-endian.1.2 ocamlfind.1.9.6 lwt.5.7.0 fswatch.11-0.1.4 dune-configurator.3.13.0 dune.3.13.0 csexp.1.5.2 cppo.1.6.9 conf-fswatch.11-0.1.3 base-bytes.base" 

You are using opam 2.1+, where external dependency handling has been integrated: consider calling opam directly, the 'depext' plugin interface is provided for backwards compatibility only
# Detecting depexts using vars: arch=x86_64, os=linux, os-distribution=debian, os-family=debian
[ERROR] No solution for fswatch_lwt.11-0.1.0 & ocplib-endian.1.2 & ocamlfind.1.9.6 & lwt.5.7.0 & fswatch.11-0.1.4 & dune-configurator.3.13.0 & dune.3.13.0 & csexp.1.5.2 & cppo.1.6.9 & conf-fswatch.11-0.1.3 & base-bytes.base:   * Missing dependency:
            - conf-fswatch
            depends on the unavailable system package 'libfswatch-dev'. Use `--no-depexts' to attempt installation anyway, or it is possible that a depext package name in the opam file is incorrect.


Command failed: opam --cli=2.1 list --readonly --external '--resolve=fswatch_lwt.11-0.1.0,ocplib-endian.1.2,ocamlfind.1.9.6,lwt.5.7.0,fswatch.11-0.1.4,dune-configurator.3.13.0,dune.3.13.0,csexp.1.5.2,cppo.1.6.9,conf-fswatch.11-0.1.3,base-bytes.base' returned 20