[MacPorts] #64427: libgphoto2: builds failing on some buildbots

[MacPorts]

#64427: libgphoto2: builds failing on some buildbots
-------------------------+------------------------
  Reporter:  mascguy     |      Owner:  ryandesign
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.1
Resolution:              |   Keywords:
      Port:  libgphoto2  |
-------------------------+------------------------

Comment (by mascguy):

 It looks like we still have some issues on older macOS releases, due to
 link-time failures:

 {{{
 Undefined symbols for architecture x86_64:
   "_static_assert", referenced from:
       _ptp_init_container in la-ptp.o
 ld: symbol(s) not found for architecture x86_64
 }}}

 https://build.macports.org/builders/ports-10.6_x86_64-builder/builds/88423/steps
 /install-port/logs/stdio

 https://build.macports.org/builders/ports-10.10_x86_64-builder/builds/171105/steps
 /install-port/logs/stdio

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Ticket URL: <https://trac.macports.org/ticket/64427#comment:8>
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