ocaml 4.06.0

Error log

The package failed to build. The error log from opam follows.

[ERROR] Package conflict!
  * No agreement on the version of ocaml:
    - (invariant) -> ocaml-base-compiler = 4.06.1 -> ocaml = 4.06.1
    - graphics = 4.06.0 -> ocaml = 4.06.0
    You can temporarily relax the switch invariant with `--update-invariant'

No solution found, exiting