[MacPorts] #65314: doxygen-devel @1.9.4: fails to build on 10.12 and earlier

[MacPorts]

#65314: doxygen-devel @1.9.4: fails to build on 10.12 and earlier
----------------------------+-----------------------
  Reporter:  ryandesign     |      Owner:  michaelld
      Type:  defect         |     Status:  reopened
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.7.2
Resolution:                 |   Keywords:
      Port:  doxygen-devel  |
----------------------------+-----------------------

Comment (by mascguy):

 Given the number of dependents, I'm reluctant to change all of those to
 use a path-style dep.

 But with `doxygen-devel`, we can at least validate the build - and general
 functionality - prior to rollout.

-- 
Ticket URL: <https://trac.macports.org/ticket/65314#comment:16>
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