[MacPorts] #45170: gtk-doc: remove source-highlight dependency or make it optional

[MacPorts]

#45170: gtk-doc: remove source-highlight dependency or make it optional
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  Reporter:  ryandesign@…  |      Owner:  devans@…
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.3.1
Resolution:                |   Keywords:
      Port:  gtk-doc       |
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Comment (by ryandesign@…):

 Unfortunately fixing boost to build on older systems may be difficult. The
 boost portfile blacklists all compilers included in Xcode on those
 versions of OS X, and even some older clang ports, and newer clang ports
 don't build on older systems and Jeremy doesn't plan to fix that either.
 Using a gcc port may still be a possibility though that implies mixing the
 system's libstdc++ with libgcc's libstdc++ which can be problematic.

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Ticket URL: <https://trac.macports.org/ticket/45170#comment:6>
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