Opam build failure: menhirLib not found

[g15ecb]

opam install merlin fails with:

./configure --prefix /Users/gbarnett/.opam/system
make
make install
The compilation of merlin.1.0 failed.
Uninstalling merlin.1.0:
make uninstall

==== ERROR [while installing merlin.1.0] ====

opam-version 1.0.0

os darwin

command make

path /Users/gbarnett/.opam/system/build/merlin.1.0

exit-code 2

env-file /Users/gbarnett/.opam/system/build/merlin.1.0/merlin-1872ec.env

stdout-file /Users/gbarnett/.opam/system/build/merlin.1.0/merlin-1872ec.out

stderr-file /Users/gbarnett/.opam/system/build/merlin.1.0/merlin-1872ec.err

stdout

ocamlbuild -Is .,typing,parsing,utils -use-ocamlfind ocamlmerlin.native
/usr/local/bin/ocamlfind ocamlopt -I /usr/local/lib/ocaml/ocamlbuild unix.cmxa /usr/local/lib/ocaml/ocamlbuild/ocamlbuildlib.cmxa myocamlbuild_config.ml myocamlbuild.ml /usr/local/lib/ocaml/ocamlbuild/ocamlbuild.cmx -o myocamlbuild
/usr/local/bin/ocamlfind ocamldep -package menhirLib -package yojson -package findlib -modules ocamlmerlin.ml > ocamlmerlin.ml.depends

• /usr/local/bin/ocamlfind ocamldep -package menhirLib -package yojson -package findlib -modules ocamlmerlin.ml > ocamlmerlin.ml.depends
  ocamlfind: Package `menhirLib' not found
  Command exited with code 2.

  stderr

  make: *** [ocamlmerlin.native] Error 10

[let-def]

I have some problem understanding your configuration, and I can't reproduce this error.

How did you install the ocaml system? Did you use brew?

[g15ecb]

I used brew to install ocaml and brew to install opam.

[g15ecb]

It seems that compiling ocaml with opam seems to have fixed the error. I must have misunderstood how opam works.

[let-def]

Well, it should have worked with system compiler, so there is a problem somewhere…
Any way, it is safer to use opam managed compiler.

[rgrinberg]

I've recently came about a similar error. I think the issue was:

1. Merlin was using the system's ocamlbuild which was using the system's ocamlfind

2. menhir, etc. were installed using opam's local ocamlfind.

[let-def]

I plan to tag v1.1 this week-end. It would be nice to close this issue, but I don't understand why this is causing problem…

Normally, make is called from opam, so its environment use opam's PATH ?!

[rgrinberg]

It is using opam's PATH. But I don't think it's using opam's ocamlbuild. But it's also using the system's ocamlbuild @ /usr/bin/ocamlbuild when using the "system" ocaml installation. For example on the system where I've encountered the problem:

opam switch system followed by eval opam config env (don't know how to escape backquotes in md)

1. which ocamlbuild -> /usr/bin/ocamlbuild

2. which ocamlfind -> ~/.opam/system/bin/ocamlfind

Which is obviously wrong...

In any case this is definitely not a bug with merlin so you can safely close this. I'm just wandering whether the OPAM people should be aware of this...

[let-def]

Oh I see! That's probably what happened.

A solution may be that opam exports OCAMLFIND_CONF / OCAML_PATH variables… I'll ask OPAM people.