Fails to build

[skrat]

!➜ ~/W/T/bizzi (mstr/*10) opam pin add eq https://github.com/jonase/eq.git
[NOTE] Package eq is already git-pinned to https://github.com/jonase/eq.git.
       This will erase any previous custom definition.
Proceed ? [Y/n] y

[eq] https://github.com/jonase/eq.git updated
[eq] Installing new package description from https://github.com/jonase/eq.git

eq needs to be installed.
The following actions will be performed:
  ∗  install ocamlfind       1.8.0            [required by eq]
  ∗  install topkg           0.9.1            [required by edn]
  ∗  install menhir          20180703         [required by edn]
  ∗  install base-bytes      base             [required by cppo]
  ∗  install cppo            1.6.4            [required by cconv]
  ∗  install cppo_ocamlbuild 1.6.0            [required by cconv]
  ∗  install cconv           0.4              [required by edn]
  ∗  install edn             0.1.5            [required by eq]
  ∗  install eq              0.1*    
===== ∗  9 =====
Do you want to continue ? [Y/n] y

=-=- Gathering sources =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[cconv] Archive in cache
[cppo] Archive in cache
[cppo_ocamlbuild] Archive in cache
[edn] Archive in cache
[menhir] Archive in cache
[ocamlfind] Archive in cache
[topkg] Archive in cache
[eq] https://github.com/jonase/eq.git already up-to-date

=-=- Processing actions -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[ERROR] The compilation of ocamlfind failed at "make all".
Processing  1/9: [ocamlfind: rm]
#=== ERROR while installing ocamlfind.1.8.0 ===================================#
# opam-version 1.2.2
# os           linux
# command      make all
# path         /home/skrat/.opam/system/build/ocamlfind.1.8.0
# compiler     system (4.06.0)
# exit-code    2
# env-file     /home/skrat/.opam/system/build/ocamlfind.1.8.0/ocamlfind-18020-2c871f.env
# stdout-file  /home/skrat/.opam/system/build/ocamlfind.1.8.0/ocamlfind-18020-2c871f.out
# stderr-file  /home/skrat/.opam/system/build/ocamlfind.1.8.0/ocamlfind-18020-2c871f.err
### stdout ###
# [...]
# ocamlc -I +compiler-libs -opaque -g -c fl_args.ml
# ocamlc -I +compiler-libs -opaque -g -c fl_lint.ml
# ocamlc -I +compiler-libs -a -o findlib.cma findlib_config.cmo fl_split.cmo fl_metatoken.cmo fl_meta.cmo fl_metascanner.cmo fl_topo.cmo fl_package_base.cmo findlib.cmo fl_args.cmo fl_lint.cmo
# ocamlc -I +compiler-libs -opaque -g -c ocaml_args.ml
# ocamlc -I +compiler-libs -opaque -g -c frontend.ml
# ocamlc -I +compiler-libs  -o ocamlfind -g findlib.cma unix.cma \
#            ocaml_args.cmo frontend.cmo
# ocamlc -I +compiler-libs -opaque -c topfind.mli
# ocamlc -I +compiler-libs -opaque -g -c topfind.ml
# make[1]: Leaving directory '/home/skrat/.opam/system/build/ocamlfind.1.8.0/src/findlib'
### stderr ###
# File "frontend.ml", line 1823, characters 16-29:
# Warning 3: deprecated: String.create
# Use Bytes.create instead.
# File "topfind.ml", line 55, characters 12-41:
# Error: Unbound module Toploop
# make[1]: *** [Makefile:165: topfind.cmo] Error 2
# make: *** [Makefile:13: all] Error 2



=-=- Error report -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
The following actions were aborted
  ∗  install base-bytes      base    
  ∗  install cconv           0.4     
  ∗  install cppo            1.6.4   
  ∗  install cppo_ocamlbuild 1.6.0   
  ∗  install edn             0.1.5   
  ∗  install eq              0.1     
  ∗  install menhir          20180703
  ∗  install topkg           0.9.1   
The following actions failed
  ∗  install ocamlfind 1.8.0
No changes have been performed
[NOTE] Pinning command successful, but your installed packages may be out of sync.

[skrat]

Sorry I have no idea how to use OCaml or Opam. Just tried to install the tool. Thank you