I'm not an ocaml expert, so someone who is might want to weigh in on this build warning:
File "host/format.d.cmo", line 1:
Warning 31: files host/format.d.cmo and spec/ocaml/ocaml-4.02.2/../install/lib/ocaml/stdlib.cma(Format) both define a module named Format
If it's not problematic, feel free to just close this issue.