Package ocaml-glpk developed by Samuel Mimram provides a OCaml language binding for GLPK. This binding is published under the GNU General Public License. The project homepage is http://ocaml-glpk.sourceforge.net/.
The code uses an obsolete API. There has been no development activity after 2010-07-02 (as observed on 2012-05-02). Probably GLPK 4.44 is supported.
To give an indication of the status of this project, the maintainer advises: "The bindings are not fully complete. If you need a specific function just tell me and I'll add it as soon as possible."