rpclib-lwt 9.0.0

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 vhdlib.0.9.1 yojson.2.1.2 xmlm.1.4.0 topkg.1.0.7 stdlib-shims.0.3.0 sexplib0.v0.16.0 seq.base rresult.0.7.0 rpclib-lwt.9.0.0 rpclib.9.0.0 rpc.9.0.0 result.1.5 ppxlib.0.31.0 ppx_deriving_rpc.9.0.0 ppx_derivers.1.2.1 ocplib-endian.1.2 ocamlfind.1.9.6 ocamlbuild.0.14.3 ocaml-compiler-libs.v0.12.4 lwt.5.7.0 dune-configurator.3.13.0 dune.3.13.0 csexp.1.5.2 cppo.1.6.9 cmdliner.1.2.0 base64.3.5.1 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 vhdlib.0.9.1 & yojson.2.1.2 & xmlm.1.4.0 & topkg.1.0.7 & stdlib-shims.0.3.0 & sexplib0.v0.16.0 & seq.base & rresult.0.7.0 & rpclib-lwt.9.0.0 & rpclib.9.0.0 & rpc.9.0.0 & result.1.5 & ppxlib.0.31.0 & ppx_deriving_rpc.9.0.0 & ppx_derivers.1.2.1 & ocplib-endian.1.2 & ocamlfind.1.9.6 & ocamlbuild.0.14.3 & ocaml-compiler-libs.v0.12.4 & lwt.5.7.0 & dune-configurator.3.13.0 & dune.3.13.0 & csexp.1.5.2 & cppo.1.6.9 & cmdliner.1.2.0 & base64.3.5.1 & base-bytes.base:   * Missing dependency:
            - vhdlib
            depends on the unavailable system package 'blktap-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=vhdlib.0.9.1,yojson.2.1.2,xmlm.1.4.0,topkg.1.0.7,stdlib-shims.0.3.0,sexplib0.v0.16.0,seq.base,rresult.0.7.0,rpclib-lwt.9.0.0,rpclib.9.0.0,rpc.9.0.0,result.1.5,ppxlib.0.31.0,ppx_deriving_rpc.9.0.0,ppx_derivers.1.2.1,ocplib-endian.1.2,ocamlfind.1.9.6,ocamlbuild.0.14.3,ocaml-compiler-libs.v0.12.4,lwt.5.7.0,dune-configurator.3.13.0,dune.3.13.0,csexp.1.5.2,cppo.1.6.9,cmdliner.1.2.0,base64.3.5.1,base-bytes.base' returned 20