[MacPorts] #65988: libdispatch: how to make linking to libblocksruntime work?

[MacPorts]

#65988: libdispatch: how to make linking to libblocksruntime work?
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  Reporter:  barracuda156  |      Owner:  kencu
      Type:  submission    |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.2
Resolution:                |   Keywords:
      Port:  libdispatch   |
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Comment (by barracuda156):

 Replying to [comment:7 kencu]:
 > that is some significant progress, if you got it to build. Are you using
 a Portfile or just building it with Xcode directly, or ???

 Turned out we can disable testing for now by setting Xcode target to
 `libdispatch`, but the build fails. I attach a log from 10.5.8 below and
 experimental portfile.

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Ticket URL: <https://trac.macports.org/ticket/65988#comment:8>
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