[MacPorts] #65480: glib2-devel @2.68.4: build fails for 10.6; undeclared identifier F_DUPFD_CLOEXEC

[MacPorts]

#65480: glib2-devel @2.68.4: build fails for 10.6; undeclared identifier
F_DUPFD_CLOEXEC
---------------------+-------------------------
 Reporter:  mascguy  |      Owner:  mascguy
     Type:  defect   |     Status:  assigned
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.7.2
 Keywords:           |       Port:  glib2-devel
---------------------+-------------------------
 Based on a quick review of upstream's changelog, this was fixed at some
 point in the past. And perhaps we have a patch in the Git history, for an
 older `glib2` release.

 Need to do more digging, but hopefully this shouldn't be a big deal to
 fix.

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Ticket URL: <https://trac.macports.org/ticket/65480>
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