[MacPorts] #45370: vips uses gobject introspection

[MacPorts]

#45370: vips uses gobject introspection
--------------------------+-----------------------
 Reporter:  ryandesign@…  |      Owner:  jcupitt@…
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.3.1
 Keywords:  haspatch      |       Port:  vips
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 vips uses gobject introspection, therefore since we don't yet have a
 gobject introspection portgroup (#45263), it falls to each portfile to
 handle this correctly. That includes:

  * add the `port:gobject-introspection` dependency (for clarity; it would
 already have been installed due to the pango dependency)
  * add the `--enable-introspection` configure argument (for clarity; it's
 enabled by default)
  * add code to build [wiki:UsingTheRightCompiler using the right compiler]
  * add the block to fix the build on Darwin 8

 See attached patch.

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Ticket URL: <https://trac.macports.org/ticket/45370>
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