[MacPorts] #54148: dolfin and vtk: python version

[MacPorts]

#54148: dolfin and vtk:  python version
------------------------+--------------------
 Reporter:  jjstickel   |      Owner:
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:  vtk python  |       Port:  dolfin
------------------------+--------------------
 While dolfin only works with python-2.7 (see #51485), the vtk dependency
 must be installed with +python27 variant. Otherwise, library linking
 errors result during DOLFIN JIT compilation when using fenics/dolfin from
 python. Adding:
 {{{
 require_active_variants vtk python27
 }}}
 to the Portfile should resolve this issue. See attached patch.

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Ticket URL: <https://trac.macports.org/ticket/54148>
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