lbvs_consent 1.1.3

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 lbvs_consent.1.1.3 qtest.2.11 qcheck.0.7 parmap.1.2.5 ounit.2.0.8 ocamlfind.1.9.6 ocamlbuild.0.14.2 obuild.0.1.10 num.1.4 minivpt.2.0.0 minicli.5.0.2 dune-configurator.3.10.0 dune.3.10.0 dolog.3.0 csexp.1.5.2 cpm.12.2.0 conf-zlib.1 conf-rdkit.1 conf-python-2-7.1.2 conf-pkg-config.3 conf-openbabel.0.1 conf-boost.1 camlzip.1.11 camlp-streams.5.0.1 bitv.1.6 batteries.3.7.1 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 lbvs_consent.1.1.3 & qtest.2.11 & qcheck.0.7 & parmap.1.2.5 & ounit.2.0.8 & ocamlfind.1.9.6 & ocamlbuild.0.14.2 & obuild.0.1.10 & num.1.4 & minivpt.2.0.0 & minicli.5.0.2 & dune-configurator.3.10.0 & dune.3.10.0 & dolog.3.0 & csexp.1.5.2 & cpm.12.2.0 & conf-zlib.1 & conf-rdkit.1 & conf-python-2-7.1.2 & conf-pkg-config.3 & conf-openbabel.0.1 & conf-boost.1 & camlzip.1.11 & camlp-streams.5.0.1 & bitv.1.6 & batteries.3.7.1 & base-bytes.base:   * Missing dependency:
            - conf-python-2-7
            depends on the unavailable system package 'python2.7'. 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=lbvs_consent.1.1.3,qtest.2.11,qcheck.0.7,parmap.1.2.5,ounit.2.0.8,ocamlfind.1.9.6,ocamlbuild.0.14.2,obuild.0.1.10,num.1.4,minivpt.2.0.0,minicli.5.0.2,dune-configurator.3.10.0,dune.3.10.0,dolog.3.0,csexp.1.5.2,cpm.12.2.0,conf-zlib.1,conf-rdkit.1,conf-python-2-7.1.2,conf-pkg-config.3,conf-openbabel.0.1,conf-boost.1,camlzip.1.11,camlp-streams.5.0.1,bitv.1.6,batteries.3.7.1,base-bytes.base' returned 20