[MacPorts] #38430: opencv: error: dispatch/dispatch.h: No such file or directory

[MacPorts]

#38430: opencv: error: dispatch/dispatch.h: No such file or directory
---------------------------+--------------------------------
  Reporter:  amontinari@…  |      Owner:  macports-tickets@…
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.1.3
Resolution:                |   Keywords:
      Port:  opencv        |
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Comment (by egall@…):

 Replying to [comment:2 ryandesign@…]:
 > The relevant error seems to be:
 > {{{
 > :info:build
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_graphics_opencv/opencv/work/OpenCV-2.4.4/modules/core/src/parallel.cpp:106:39:
 error: dispatch/dispatch.h: No such file or directory
 > }}}

 That makes sense, considering that `dispatch/dispatch.h` is part of Grand
 Central Dispatch, which was introduced in 10.6, and apparently OP is only
 10.5. I can think of two solutions: either prevent OpenCV from building on
 10.5, or create a port for `libdispatch` that runs on 10.5. I actually
 already know of an implementation of `libdispatch` that runs on 10.5:
 http://daagaak.github.com/WiganWallgate/

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Ticket URL: <https://trac.macports.org/ticket/38430#comment:3>
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