Installation failure on Ubuntu 16.04

[timothymillar]

Hi, I'm having issue installing iocaml on ubuntu 16.04:

$ opam install iocaml
The following actions will be performed:
  ∗  install iocaml 0.4.9

=-=- Gathering sources =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[default] https://opam.ocaml.org/archives/iocaml.0.4.9+opam.tar.gz downloaded

=-=- Processing actions -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[ERROR] The compilation of iocaml failed at "make all".

#=== ERROR while installing iocaml.0.4.9 ======================================#
# opam-version 1.2.2
# os           linux
# command      make all
# path         /home/tim/.opam/system/build/iocaml.0.4.9
# compiler     system (4.02.3)
# exit-code    2
# env-file     /home/tim/.opam/system/build/iocaml.0.4.9/iocaml-28311-ad8886.env
# stdout-file  /home/tim/.opam/system/build/iocaml.0.4.9/iocaml-28311-ad8886.out
# stderr-file  /home/tim/.opam/system/build/iocaml.0.4.9/iocaml-28311-ad8886.err
### stdout ###
# [...]
# Error: This expression has type
#          int ->
#          Cohttp.Request.t ->
#          (unit -> Websocket_lwt.Frame.t Lwt.t) ->
#          (Websocket_lwt.Frame.t -> unit Lwt.t) -> unit Lwt.t
#        but an expression was expected of type
#          Websocket_lwt.Connected_client.t -> unit Lwt.t
#        Type int is not compatible with type Websocket_lwt.Connected_client.t 
# Command exited with code 2.
# makefile:13: recipe for target 'iocamlserver.byte' failed
### stderr ###
# make: *** [iocamlserver.byte] Error 10



=-=- Error report -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
The following actions failed
  ∗  install iocaml 0.4.9
No changes have been performed