ocaml - opam fails trying to install lwt looking for pthreads -

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On Ubuntu dependable VM, I recommended OPAM (version 1.2.0) from PAP to Real World Open Set. I

Docs. 

  opam install lwt

is running, and check the .out file show: 

  Test for pthread: ........................... unavailable for glib unavailable following Recovery C library are missing: pthread

I have the Ubuntu package libpthread-stubs0-dev installed. What do I need to install to install?

According to:

14.04 [Trustee] Okkal and Opam Comes with recent editions.

otherwise Opam often chooses the wrong versions of the package, and I have seen this error once in that situation.


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