[vsiles@vsiles-mbp:~]
$ opam switch import "/Users/vsiles/.opam/4.06.1/.opam-switch/backup/state-20181213082329.export"
The following actions will be performed:
  ∗ install ocp-build 1.99.20-beta
Do you want to continue? [Y/n] Y

<><> Gathering sources ><><><><><><><><><><><><><><><><><><><><><><><><><><>  🐫
[ocp-build.1.99.20-beta] found in cache

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><>  🐫
[ERROR] The compilation of ocp-build failed at "/Users/vsiles/.opam/opam-init/hooks/sandbox.sh build make".

#=== ERROR while compiling ocp-build.1.99.20-beta =============================#
# context     2.0.0 | macos/x86_64 | ocaml-base-compiler.4.06.1 | https://opam.ocaml.org#83c18f40
# path        ~/.opam/4.06.1/.opam-switch/build/ocp-build.1.99.20-beta
# command     ~/.opam/opam-init/hooks/sandbox.sh build make
# exit-code   2
# env-file    ~/.opam/log/ocp-build-74439-05296d.env
# output-file ~/.opam/log/ocp-build-74439-05296d.out
### output ###
# Undefined symbols for architecture x86_64:
# [...]
#       _caml_builtin_cprim in camlprimee88f3-ea755b.o
#   "_minUnix_waitpid", referenced from:
#       _caml_builtin_cprim in camlprimee88f3-ea755b.o
# ld: symbol(s) not found for architecture x86_64
# clang: error: linker command failed with exit code 1 (use -v to see invocation)
# File "_none_", line 1:
# Error: Error while building custom runtime system
#
# Error:
# rule 503: target ./_obuild/ocp-autoconf/ocp-autoconf.byte not built
# make: *** [build-ocps] Error 2



<><> Error report <><><><><><><><><><><><><><><><><><><><><><><><><><><><><>  🐫
┌─ The following actions failed
│ λ build ocp-build 1.99.20-beta
└─
╶─ No changes have been performed
[vsiles@vsiles-mbp:~]