[MacPorts] #50687: netgen @5.3.1 Add nglib and occ variants

[MacPorts]

#50687: netgen @5.3.1 Add nglib and occ variants
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 Reporter:  ian.rees@…   |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.3.4
 Keywords:               |       Port:  netgen
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 I've added two variants, which are meant to enable features available in
 the netgen configure script.  The nglib variant installs a shared library
 for netgen, and the occ variant builds in support for the opencascade CAD
 kernel.

 The nglib variant is a little more complex than might be expected - this
 is because using nglib requires some headers, which aren't installed by
 netgen's makefile.  Those headers are installed into
 ${prefix}/share/netgen/libsrc following the example used in Linux
 distributions.

 The occ variant requires a small patch, also included.

 Reason for this request is to enable the finite element workbench in
 FreeCAD, which uses nglib for meshing.  Thanks!  -Ian-

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Ticket URL: <https://trac.macports.org/ticket/50687>
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