Assume DESTDIR points to the build chroot itself ...

... and not the ocaml library directory within the chroot.

If I disable ocamlfind then I get this:

$ make install DESTDIR=/tmp/without-ocamlfind
install -d /tmp/without-ocamlfind/usr/lib64/ocaml/oclock
install -t /tmp/without-ocamlfind/usr/lib64/ocaml/oclock oclock.cma ...

If I enable ocamlfind then I get this:

$ make install DESTDIR=/tmp/with-ocamlfind
ocamlfind install oclock oclock.cma oclock.cmxa liboclock.a ...
Installed /tmp/with-ocamlfind/usr/lib64/ocaml/oclock/oclock.a
...