ocaml-gettext and ocaml-gettext-devel packages don't have
sufficient run-time dependencies to work in most cases.

virt-df (http://www.annexia.org/tmp/ocaml/virt-df.spec)
needed:

# Tortuous list of BRs for gettext.
BuildRequires:  ocaml-gettext-devel >= 0.3.0
BuildRequires:  ocaml-fileutils-devel
%ifnarch ppc64
BuildRequires:  ocaml-camomile-data
%endif

There are several probable issues here:

(1) The standalone ocaml-gettext program needs camomile
data files, but only if it was compiled with camomile.
(ie. currently not on ppc64).

(2) fileutils.cmxa is required by any program which links
with gettext-stubs library, thus ocaml-gettext-devel should
require ocaml-fileutils-devel.  (This may be a more
systematic problem with the automatic dependency
generator in the base OCaml module, since it doesn't
cover native libraries, but should).