The copyright holders of Gmsh give you permission to combine Gmsh with code
included in the standard release of Netgen (from Joachim Sch"oberl), METIS
(from George Karypis at the University of Minnesota), OpenCASCADE (from
Open CASCADE S.A.S) and ParaView (from Kitware, Inc.) under their
respective licenses. You may copy and distribute such a system following
the terms of the GNU GPL for Gmsh and the licenses of the other code
concerned, provided that you include the source code of that other code
when and as the GNU GPL requires distribution of source code.

Note that people who make modified versions of Gmsh are not obligated to
grant this special exception for their modified versions; it is their
choice whether to do so. The GNU General Public License gives permission to
release a modified version without this exception; this exception also
makes it possible to release a modified version which carries forward this
exception.


