The compilation of ocamlfind failed at "install -m 0755 ocaml-stub - bash

Question

I'm new to OCaml and I'm trying to install cohttp. After a failure because I hadn't accepted the Xcode license agreement (OS X Sierra 10.12.6) I get an error while the package manager (opam) is trying to install a sub-dependency, ocamlfind.
=-=- Processing actions -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= 🐫
[ERROR] The compilation of ocamlfind failed at "install -m 0755 ocaml-stub /Users/greg/.opam/system/bin/ocaml".
Processing 1/27: [ocamlfind: rm]
#=== ERROR while installing ocamlfind.1.7.3-1 =================================#
# opam-version 1.2.2
# os darwin
# command install -m 0755 ocaml-stub /Users/greg/.opam/system/bin/ocaml
# path /Users/greg/.opam/system/build/ocamlfind.1.7.3-1
# compiler system (4.05.0)
# exit-code 127
# env-file /Users/greg/.opam/system/build/ocamlfind.1.7.3-1/ocamlfind-93888-487c34.env
# stdout-file /Users/greg/.opam/system/build/ocamlfind.1.7.3-1/ocamlfind-93888-487c34.out
# stderr-file /Users/greg/.opam/system/build/ocamlfind.1.7.3-1/ocamlfind-93888-487c34.err
The log files are empty. The env file has this (lightly edited):
PATH=/Users/greg/.opam/system/bin:/usr/local/google-cloud-sdk/bin:/Users/greg/.nvm/versions/node/v6.5.0/bin::/opt/chefdk/bin:/usr/local/mysql/bin:/usr/local/share/npm/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Users/greg/.chefdk/gem/ruby/2.1.0/bin
OCAML_TOPLEVEL_PATH=/Users/greg/.opam/system/lib/toplevel
PERL5LIB=/Users/greg/.opam/system/lib/perl5:
MANPATH=/Users/greg/.opam/system/man:/Users/greg/.nvm/versions/node/v6.5.0/share/man:/usr/local/mysql/man:/usr/local/share/man:/usr/share/man:/Applications/Xcode.app/Contents/Developer/usr/share/man:/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/share/man
OPAMSWITCH=system
OPAMUTF8MSGS=1
CAML_LD_LIBRARY_PATH=/Users/greg/.opam/system/lib/stublibs:/usr/local/lib/ocaml/stublibs
TERM_PROGRAM=Apple_Terminal
TERM=xterm-256color
SHELL=/bin/bash
TMPDIR=/var/folders/fq/9ggcftcj1lsb150mldyjn5sh0000gn/T/
NVM_PATH=/Users/greg/.nvm/versions/node/v6.5.0/lib/node
Apple_PubSub_Socket_Render=/private/tmp/com.apple.launchd.jNLKBcDJTX/Render
TERM_PROGRAM_VERSION=388.1.1
TERM_SESSION_ID=E845D49D-9C60-4CEA-8777-19F521ED83A1
NVM_DIR=/Users/greg/.nvm
USER=greg
SSH_AUTH_SOCK=/private/tmp/com.apple.launchd.0CA6ZcRBJQ/Listeners
__CF_USER_TEXT_ENCODING=0x1F5:0x0:0x52
NVM_NODEJS_ORG_MIRROR=https://nodejs.org/dist
PWD=/Users/greg/dev/ocaml
EDITOR=emacs
LANG=en_CA.UTF-8
NODE_PATH=./src
XPC_FLAGS=0x0
NODE_ENV=development
XPC_SERVICE_NAME=0
HOME=/Users/greg
SHLVL=1
LOGNAME=greg
NVM_BIN=/Users/greg/.nvm/versions/node/v6.5.0/bin
NVM_IOJS_ORG_MIRROR=https://iojs.org/dist
PROMPT_COMMAND=set_tab_title
_=/usr/local/bin/opam
OPAM_PACKAGE_VERSION=1.7.3-1
OPAM_PACKAGE_NAME=ocamlfind
MAKELEVEL=
MAKEFLAGS=
I don't have a lot to go on to debug this. Any suggestions on where to go from here?

Answer 1

This github issue for opam led me to a solution that worked for me: https://github.com/ocaml/opam-repository/issues/10064
The solution to the github issue was that the user had the local directory, ., in their $PATH which led to the wrong install command being run. This wasn't my problem, but I had an extra : in my path.
/Users/greg/.nvm/versions/node/v6.5.0/bin::/opt/chefdk/bin:/usr/local/mysql/bin:/usr/local/share/npm/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin
According to the comment below having two colons in a row in the path string will add the empty string as part of the path which is interpreted as the current directory.
Removing the extra colon allows the install of ocamlfind to succeed.