ocaml-base-compiler 4.10.1

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 1.2.1-1

<><> 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 noCanren.0.2.0 topkg.1.0.7 time_now.v0.15.0 stdlib-shims.0.3.0 stdio.v0.15.0 sexplib0.v0.15.1 seq.base rresult.0.7.0 re.1.11.0 ppxlib.0.31.0 ppx_tools.6.6 ppx_sexp_conv.v0.15.1 ppx_optcomp.v0.15.0 ppx_inline_test.v0.15.1 ppx_here.v0.15.0 ppx_hash.v0.15.0 ppx_enumerate.v0.15.0 ppx_derivers.1.2.1 ppx_compare.v0.15.0 ppx_cold.v0.15.0 ppx_base.v0.15.0 ppx_assert.v0.15.0 ocamlgraph.2.1.0 ocamlfind.1.9.6 ocamlbuild.0.14.3 ocaml-migrate-parsetree.2.4.0 ocaml-compiler-libs.v0.12.4 not-ocamlfind.0.12 logs.0.7.0 logger-p5.0.4.5 jst-config.v0.15.1 jane-street-headers.v0.15.0 GT.0.5.1 fpath.0.7.3 fmt.0.9.0 dune-configurator.3.13.0 dune.3.13.0 csexp.1.5.2 cppo.1.6.9 conf-which.1 conf-perl.2 conf-m4.1 conf-bash.1 camlp5-buildscripts.0.03 camlp5.8.02.01 camlp-streams.5.0.1 bos.0.2.1 base.v0.15.1 astring.0.8.5" 

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 noCanren.0.2.0 & topkg.1.0.7 & time_now.v0.15.0 & stdlib-shims.0.3.0 & stdio.v0.15.0 & sexplib0.v0.15.1 & seq.base & rresult.0.7.0 & re.1.11.0 & ppxlib.0.31.0 & ppx_tools.6.6 & ppx_sexp_conv.v0.15.1 & ppx_optcomp.v0.15.0 & ppx_inline_test.v0.15.1 & ppx_here.v0.15.0 & ppx_hash.v0.15.0 & ppx_enumerate.v0.15.0 & ppx_derivers.1.2.1 & ppx_compare.v0.15.0 & ppx_cold.v0.15.0 & ppx_base.v0.15.0 & ppx_assert.v0.15.0 & ocamlgraph.2.1.0 & ocamlfind.1.9.6 & ocamlbuild.0.14.3 & ocaml-migrate-parsetree.2.4.0 & ocaml-compiler-libs.v0.12.4 & not-ocamlfind.0.12 & logs.0.7.0 & logger-p5.0.4.5 & jst-config.v0.15.1 & jane-street-headers.v0.15.0 & GT.0.5.1 & fpath.0.7.3 & fmt.0.9.0 & dune-configurator.3.13.0 & dune.3.13.0 & csexp.1.5.2 & cppo.1.6.9 & conf-which.1 & conf-perl.2 & conf-m4.1 & conf-bash.1 & camlp5-buildscripts.0.03 & camlp5.8.02.01 & camlp-streams.5.0.1 & bos.0.2.1 & base.v0.15.1 & astring.0.8.5:   * Incompatible packages:
            - (invariant) -> ocaml-base-compiler = 4.10.2
            - noCanren < 0.3.0~alpha1 -> ocaml = 4.10.1 -> ocaml-system >= 4.10.1
            You can temporarily relax the switch invariant with `--update-invariant'
          * Missing dependency:
            - noCanren < 0.3.0~alpha1 -> ocaml = 4.10.1 -> ocaml-variants >= 4.10.1 -> ocaml-beta
            unmet availability conditions: 'enable-ocaml-beta-repository'


Command failed: opam --cli=2.1 list --readonly --external '--resolve=noCanren.0.2.0,topkg.1.0.7,time_now.v0.15.0,stdlib-shims.0.3.0,stdio.v0.15.0,sexplib0.v0.15.1,seq.base,rresult.0.7.0,re.1.11.0,ppxlib.0.31.0,ppx_tools.6.6,ppx_sexp_conv.v0.15.1,ppx_optcomp.v0.15.0,ppx_inline_test.v0.15.1,ppx_here.v0.15.0,ppx_hash.v0.15.0,ppx_enumerate.v0.15.0,ppx_derivers.1.2.1,ppx_compare.v0.15.0,ppx_cold.v0.15.0,ppx_base.v0.15.0,ppx_assert.v0.15.0,ocamlgraph.2.1.0,ocamlfind.1.9.6,ocamlbuild.0.14.3,ocaml-migrate-parsetree.2.4.0,ocaml-compiler-libs.v0.12.4,not-ocamlfind.0.12,logs.0.7.0,logger-p5.0.4.5,jst-config.v0.15.1,jane-street-headers.v0.15.0,GT.0.5.1,fpath.0.7.3,fmt.0.9.0,dune-configurator.3.13.0,dune.3.13.0,csexp.1.5.2,cppo.1.6.9,conf-which.1,conf-perl.2,conf-m4.1,conf-bash.1,camlp5-buildscripts.0.03,camlp5.8.02.01,camlp-streams.5.0.1,bos.0.2.1,base.v0.15.1,astring.0.8.5' returned 20