opam pin add -y cohttp https://github.com/mirage/ocaml-cohttp                                                                                                                                                  ⏎
[NOTE] Package cohttp is already http-pinned to https://github.com/mirage/ocaml-cohttp.
       This will erase any previous custom definition.
Proceed ? [Y/n] y

[cohttp] https://github.com/mirage/ocaml-cohttp downloaded

cohttp needs to be installed.
The following actions will be performed:
  ∗  install cstruct 2.1.0                    [required by conduit]
  ∗  install conduit 0.12.0                   [required by cohttp]
  ∗  install cohttp  0.21.0*
===== ∗  3 =====

=-=- Gathering sources =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=  🐫
[conduit] Archive in cache
[cstruct] Archive in cache
[cohttp.0.21.0] https://github.com/mirage/ocaml-cohttp downloaded

=-=- Processing actions -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=  🐫
∗  installed cstruct.2.1.0
∗  installed conduit.0.12.0
[ERROR] The compilation of cohttp failed at "make PREFIX=/Users/Edgar/.opam/working".
Processing  3/3: [cohttp: ocamlfind remove]
#=== ERROR while installing cohttp.0.21.0 =====================================#
# opam-version 1.2.2
# os           darwin
# command      make PREFIX=/Users/Edgar/.opam/working
# path         /Users/Edgar/.opam/working/build/cohttp.0.21.0
# compiler     4.03.0
# exit-code    2
# env-file     /Users/Edgar/.opam/working/build/cohttp.0.21.0/cohttp-25329-60459a.env
# stdout-file  /Users/Edgar/.opam/working/build/cohttp.0.21.0/cohttp-25329-60459a.out
# stderr-file  /Users/Edgar/.opam/working/build/cohttp.0.21.0/cohttp-25329-60459a.err
### stderr ###
# make: *** No targets specified and no makefile found.  Stop.