core-lwt 0.1

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 1.2.3

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
-> retrieved opam-depext.1.2.3  (cached)
-> removed   opam-depext.1.2.3
-> installed opam-depext.1.2.3
Done.

<><> opam-depext.1.2.3 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 bap-server.0.1.0 zed.1.6 zarith.1.13 variantslib.113.24.00 uutf.1.0.3 uuidm.0.9.7 utop.2.2.0 uri.1.9.2 uchar.0.0.2 typerep.113.24.00 topkg.1.0.4 stringext.1.6.0 stdlib-shims.0.3.0 sexplib.113.33.00+4.03 seq.0.3.1 result.1.5 regular.1.3.0 react.1.2.1 re.1.11.0 ppxfind.1.4 ppx_variants_conv.113.33.00+4.03 ppx_typerep_conv.113.33.00+4.03 ppx_type_conv.113.33.02+4.03 ppx_tools.5.0 ppx_sexp_value.113.33.00+4.03 ppx_sexp_message.113.33.00+4.03 ppx_sexp_conv.113.33.01+4.03 ppx_pipebang.113.33.00+4.03 ppx_optcomp.113.33.01+4.03 ppx_let.113.33.00+4.03 ppx_jane.113.33.00 ppx_inline_test.113.33.00+4.03 ppx_here.113.33.00 ppx_fields_conv.113.33.00+4.03 ppx_fail.113.33.00+4.03 ppx_expect.113.33.01+4.03 ppx_enumerate.113.33.00+4.03 ppx_driver.113.33.02+4.03 ppx_deriving.4.5-1 ppx_derivers.1.2.1 ppx_custom_printf.113.33.00+4.03 ppx_core.113.33.01+4.03 ppx_compare.113.33.00+4.03 ppx_bin_prot.113.33.00+4.03 ppx_bench.113.33.00+4.03 ppx_assert.113.33.00 ogre.1.0 ocamlmod.0.0.9 ocamlify.0.0.1 ocamlgraph.2.0.0 ocamlfind.1.9.6 ocamlbuild.0.14.3 ocaml-migrate-parsetree.1.8.0 oasis.0.4.7 monads.1.0 magic-mime.1.3.1 lwt_react.1.0.0 lwt.2.7.1 logs.0.7.0 lambda-term.1.12.0 jsonm.1.0.1 jbuilder.1.0+beta20.2 ipaddr.2.7.2 host-arch-x86_64.1 hex.1.4.0 graphlib.1.2.0 fileutils.0.6.4 fieldslib.113.24.00 ezjsonm.0.4.3 dune.3.16.0 cstruct.6.0.1 cppo_ocamlbuild.1.7.0 cppo.1.7.0 core_kernel.113.33.02+4.03 core-lwt.0.1 conf-zlib.1 conf-which.1 conf-pkg-config.3 conf-gmp.4 conf-env-travis.1 conf-clang.1 conf-bap-llvm.1.6 conduit.0.15.3 cohttp.0.21.0 cmdliner.1.0.4 camomile.1.0.2 camlzip.1.10 bin_prot.113.33.00+4.03 bigarray-compat.1.1.0 base64.2.3.0 base-bytes.base bap-std.1.3.0 bap-llvm.1.3.0 bap-future.1.3.0 bap-c.1.3.0 bap-arm.1.3.0 bap-api.1.3.0 bap-abi.1.3.0" 

Since version 2.1, opam now handles external dependencies alongside OCaml ones, and the `depext` plugin interface is provided for backwards compatibility only. Consider using your usual `opam install` command to install both OCaml and system dependencies, or `opam install <pkg> --depext-only` if you want to only install external dependencies.
# Detecting depexts using vars: arch=x86_64, os=linux, os-distribution=debian, os-family=debian
[ERROR] No solution for bap-server.0.1.0 & zed.1.6 & zarith.1.13 & variantslib.113.24.00 & uutf.1.0.3 & uuidm.0.9.7 & utop.2.2.0 & uri.1.9.2 & uchar.0.0.2 & typerep.113.24.00 & topkg.1.0.4 & stringext.1.6.0 & stdlib-shims.0.3.0 & sexplib.113.33.00+4.03 & seq.0.3.1 & result.1.5 & regular.1.3.0 & react.1.2.1 & re.1.11.0 & ppxfind.1.4 & ppx_variants_conv.113.33.00+4.03 & ppx_typerep_conv.113.33.00+4.03 & ppx_type_conv.113.33.02+4.03 & ppx_tools.5.0 & ppx_sexp_value.113.33.00+4.03 & ppx_sexp_message.113.33.00+4.03 & ppx_sexp_conv.113.33.01+4.03 & ppx_pipebang.113.33.00+4.03 & ppx_optcomp.113.33.01+4.03 & ppx_let.113.33.00+4.03 & ppx_jane.113.33.00 & ppx_inline_test.113.33.00+4.03 & ppx_here.113.33.00 & ppx_fields_conv.113.33.00+4.03 & ppx_fail.113.33.00+4.03 & ppx_expect.113.33.01+4.03 & ppx_enumerate.113.33.00+4.03 & ppx_driver.113.33.02+4.03 & ppx_deriving.4.5-1 & ppx_derivers.1.2.1 & ppx_custom_printf.113.33.00+4.03 & ppx_core.113.33.01+4.03 & ppx_compare.113.33.00+4.03 & ppx_bin_prot.113.33.00+4.03 & ppx_bench.113.33.00+4.03 & ppx_assert.113.33.00 & ogre.1.0 & ocamlmod.0.0.9 & ocamlify.0.0.1 & ocamlgraph.2.0.0 & ocamlfind.1.9.6 & ocamlbuild.0.14.3 & ocaml-migrate-parsetree.1.8.0 & oasis.0.4.7 & monads.1.0 & magic-mime.1.3.1 & lwt_react.1.0.0 & lwt.2.7.1 & logs.0.7.0 & lambda-term.1.12.0 & jsonm.1.0.1 & jbuilder.1.0+beta20.2 & ipaddr.2.7.2 & host-arch-x86_64.1 & hex.1.4.0 & graphlib.1.2.0 & fileutils.0.6.4 & fieldslib.113.24.00 & ezjsonm.0.4.3 & dune.3.16.0 & cstruct.6.0.1 & cppo_ocamlbuild.1.7.0 & cppo.1.7.0 & core_kernel.113.33.02+4.03 & core-lwt.0.1 & conf-zlib.1 & conf-which.1 & conf-pkg-config.3 & conf-gmp.4 & conf-env-travis.1 & conf-clang.1 & conf-bap-llvm.1.6 & conduit.0.15.3 & cohttp.0.21.0 & cmdliner.1.0.4 & camomile.1.0.2 & camlzip.1.10 & bin_prot.113.33.00+4.03 & bigarray-compat.1.1.0 & base64.2.3.0 & base-bytes.base & bap-std.1.3.0 & bap-llvm.1.3.0 & bap-future.1.3.0 & bap-c.1.3.0 & bap-arm.1.3.0 & bap-api.1.3.0 & bap-abi.1.3.0:   * Missing dependency:
            - conf-bap-llvm >= 1.1
            depends on the unavailable system package 'llvm-9-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=bap-server.0.1.0,zed.1.6,zarith.1.13,variantslib.113.24.00,uutf.1.0.3,uuidm.0.9.7,utop.2.2.0,uri.1.9.2,uchar.0.0.2,typerep.113.24.00,topkg.1.0.4,stringext.1.6.0,stdlib-shims.0.3.0,sexplib.113.33.00+4.03,seq.0.3.1,result.1.5,regular.1.3.0,react.1.2.1,re.1.11.0,ppxfind.1.4,ppx_variants_conv.113.33.00+4.03,ppx_typerep_conv.113.33.00+4.03,ppx_type_conv.113.33.02+4.03,ppx_tools.5.0,ppx_sexp_value.113.33.00+4.03,ppx_sexp_message.113.33.00+4.03,ppx_sexp_conv.113.33.01+4.03,ppx_pipebang.113.33.00+4.03,ppx_optcomp.113.33.01+4.03,ppx_let.113.33.00+4.03,ppx_jane.113.33.00,ppx_inline_test.113.33.00+4.03,ppx_here.113.33.00,ppx_fields_conv.113.33.00+4.03,ppx_fail.113.33.00+4.03,ppx_expect.113.33.01+4.03,ppx_enumerate.113.33.00+4.03,ppx_driver.113.33.02+4.03,ppx_deriving.4.5-1,ppx_derivers.1.2.1,ppx_custom_printf.113.33.00+4.03,ppx_core.113.33.01+4.03,ppx_compare.113.33.00+4.03,ppx_bin_prot.113.33.00+4.03,ppx_bench.113.33.00+4.03,ppx_assert.113.33.00,ogre.1.0,ocamlmod.0.0.9,ocamlify.0.0.1,ocamlgraph.2.0.0,ocamlfind.1.9.6,ocamlbuild.0.14.3,ocaml-migrate-parsetree.1.8.0,oasis.0.4.7,monads.1.0,magic-mime.1.3.1,lwt_react.1.0.0,lwt.2.7.1,logs.0.7.0,lambda-term.1.12.0,jsonm.1.0.1,jbuilder.1.0+beta20.2,ipaddr.2.7.2,host-arch-x86_64.1,hex.1.4.0,graphlib.1.2.0,fileutils.0.6.4,fieldslib.113.24.00,ezjsonm.0.4.3,dune.3.16.0,cstruct.6.0.1,cppo_ocamlbuild.1.7.0,cppo.1.7.0,core_kernel.113.33.02+4.03,core-lwt.0.1,conf-zlib.1,conf-which.1,conf-pkg-config.3,conf-gmp.4,conf-env-travis.1,conf-clang.1,conf-bap-llvm.1.6,conduit.0.15.3,cohttp.0.21.0,cmdliner.1.0.4,camomile.1.0.2,camlzip.1.10,bin_prot.113.33.00+4.03,bigarray-compat.1.1.0,base64.2.3.0,base-bytes.base,bap-std.1.3.0,bap-llvm.1.3.0,bap-future.1.3.0,bap-c.1.3.0,bap-arm.1.3.0,bap-api.1.3.0,bap-abi.1.3.0' --color=never returned 20