Build failure on 4.09 #382
Description
See https://travis-ci.org/ocaml/odoc/jobs/584430492#L403:
File "src/model/ident_env.cppo.ml", line 152, characters 41-57:
Error: Unbound value Compat.signature
It's probably because of this condition:
Line 70 in 61ac0c9
from #309. cc @jonludlam