[MacPorts] #57761: netgen: add opencascade variant

[MacPorts]

#57761: netgen: add opencascade variant
-------------------------+---------------------------------
 Reporter:  mbrethen     |      Owner:  MarcusCalhoun-Lopez
     Type:  enhancement  |     Status:  assigned
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.5.4
 Keywords:               |       Port:  netgen
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 The netgen port occ variant has a dependency on the oce (Open CASCADE
 Community Edition) port. This conflicts with opencascade which other ports
 such as gmsh depend on. Is it possible to add an opencascade variant to
 netgen?

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Ticket URL: <https://trac.macports.org/ticket/57761>
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