[MacPorts] #65532: isl @0.25: builds failing for 10.13: call to unavailable member function 'value'

[MacPorts]

#65532: isl @0.25: builds failing for 10.13: call to unavailable member function
'value'
-------------------------+----------------------
  Reporter:  dyne2meter  |      Owner:  mascguy
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.2
Resolution:              |   Keywords:
      Port:  isl         |
-------------------------+----------------------
Changes (by mascguy):

 * owner:  MarcusCalhoun-Lopez => mascguy
 * cc: mascguy (removed)
 * cc: MarcusCalhoun-Lopez (added)


Comment:

 Marcus, since I merged the PR for this update, I'm happy to take on
 fixing. Could use some guidance though, relative to the best approach.

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Ticket URL: <https://trac.macports.org/ticket/65532#comment:7>
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