Hello Marius,
Thank you for your review.
> I wonder if this could fit in "engineering.scm". Or maybe
> "geometry.scm"
> or "3d.scm". We try to avoid "single program" modules. What do you
> think?
Perhaps maths.scm is the best place, in order to avoid creating a new
module.  The Gmsh package is already there.  To check; am I right in
saying that a library in one module can be used as an input for a
package in another module?  For example, if FreeCAD were to be
packaged, and placed in engineering.scm, could it use opencascade-oce
as an input from maths.scm?
> > 
> > +(define-public opencascade-oce
> > +  (package
> > +    (name "opencascade-oce")
> > +    (version "0.17.2")
> > 

> 
> 
> Version 0.18 was released a few days ago!
> 

It would be useful to package both versions.  There is a difference in
the OpenGL graphics card requirements in going from version 0.17.2 to
0.18.
> > 
> > +    (license license:lgpl2.1))) ; plus header files exception
> > 

> 
> 
> Please expand on the exception comment and mention
> OCCT_LGPL_EXCEPTION.txt. There are also some public domain files, and
> the bundled "gtest" is bsd-3. src/OpenGl/OpenGl_glext.h is distributed
> under the expat license. Some files generated by "bison" has GPL3+.
> 

I have added the information about the expat and BSD-3 licenses.  Can
you elaborate on the public domain files and Bison?
Best,
Paul.