i just tried building the package and had to do a few things:

1. adjust the path to the lacaml installation in myocamlbuild.ml (easy but not mentioned in the README)
2. building succeeded only after replacing:
   (* open Lacaml.Impl.D *)
   open Lacaml.D
   at the top of ellipse.ml
3. after these steps, the run_tests still fail with
   File "test/asserts.ml", line 4, characters 48-54:
   Error: The function applied to this argument has type
   ?epsilon:float -> float -> float -> bool
   This argument cannot be applied with label ~epsabs

(ocaml 4.00.1, lacaml 7.0.6)

anyway, just for reference