Opam failures on macOS Sierra

Question

I'm having problems very similar to this question.

I have a MacBook Pro on macOS Sierra. I've installed ocaml and opam via brew. (brew install ocaml, brew install opam) This installed ocaml 4.03.0, and it appears to work fine on its own.

I tried to install oasis (opam install oasis), but the installation failed due to a failure in installing ocamlfind:

➜  ~ opam install ocamlfind
The following actions will be performed:
  ∗  install ocamlfind 1.6.2

=-=- Gathering sources =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=  🐫
[ocamlfind] Archive in cache

=-=- Processing actions -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=  🐫
[ERROR] The compilation of ocamlfind failed at "./configure -bindir /Users/drautb/.opam/system/bin -sitelib /Users/drautb/.opam/system/lib -mandir /Users/drautb/.opam/system/man -config /Users/drautb/.opam/system/lib/findlib.conf -no-custom -no-topfind".
Processing  1/1: [ocamlfind: rm]
#=== ERROR while installing ocamlfind.1.6.2 ===================================#
# opam-version 1.2.2
# os           darwin
# command      ./configure -bindir /Users/drautb/.opam/system/bin -sitelib /Users/drautb/.opam/system/lib -mandir /Users/drautb/.opam/system/man -config /Users/drautb/.opam/system/lib/findlib.conf -no-custom -no-topfind
# path         /Users/drautb/.opam/system/build/ocamlfind.1.6.2
# compiler     system (4.03.0)
# exit-code    1
# env-file     /Users/drautb/.opam/system/build/ocamlfind.1.6.2/ocamlfind-41584-6d07ae.env
# stdout-file  /Users/drautb/.opam/system/build/ocamlfind.1.6.2/ocamlfind-41584-6d07ae.out
# stderr-file  /Users/drautb/.opam/system/build/ocamlfind.1.6.2/ocamlfind-41584-6d07ae.err
### stdout ###
# [...]
# Configuration for str written to site-lib-src/str/META
# Configuration for threads written to site-lib-src/threads/META
# Configuration for unix written to site-lib-src/unix/META
# Configuration for stdlib written to site-lib-src/stdlib/META
# Configuration for bigarray written to site-lib-src/bigarray/META
# Configuration for ocamldoc written to site-lib-src/ocamldoc/META
# Configuration for camlp4 written to site-lib-src/camlp4/META
# Configuration for compiler-libs written to site-lib-src/compiler-libs/META
# Configuration for bytes written to site-lib-src/bytes/META
# Detecting compiler arguments: FAILED (see the file ocargs.log for details)
### stderr ###
# ./configure: line 553: cd: src: No such file or directory



=-=- Error report -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=  🐫
The following actions failed
  ∗  install ocamlfind 1.6.2
No changes have been performed

I thought it might be related to ocaml 4.03.0, so I tried switching to ocaml 4.02.1. (opam switch 4.02.1) This fails also:

➜  ~ opam switch 4.02.1

=-=- Installing compiler 4.02.1 -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=  🐫
[default.comp] http://caml.inria.fr/pub/distrib/ocaml-4.02/ocaml-4.02.1.tar.gz downloaded
Now compiling OCaml. This may take a while, please bear with us...
[ERROR] Compiler build failed at "./configure -prefix /Users/drautb/.opam/4.02.1 -with-debug-runtime":
        # opam-version 1.2.2
        # os           darwin
        # command      ./configure -prefix /Users/drautb/.opam/4.02.1 -with-debug-runtime
        # path         /Users/drautb/.opam/4.02.1/build/ocaml
        # exit-code    2
        # env-file     /Users/drautb/.opam/log/log-42620-d2c37b.env
        # stdout-file  /Users/drautb/.opam/log/log-42620-d2c37b.out
        # stderr-file  /Users/drautb/.opam/log/log-42620-d2c37b.err
        ### stdout ###
        # [ERROR!]Cannot guess host type. You must specify one with the -host option.
        ### stderr ###
        # ./configure: line 190: cd: config/auto-aux: No such file or directory
        # ./configure: line 222: ../gnu/config.guess: No such file or directory

I've tried reinstalling XCode, I've tried reinstalling ocaml and opam via homebrew with the --build-from-source option, (including rm -rf ~/.opam) and the errors persist.

Has anyone else had issues like this?