[MacPorts] #43245: Port 2.2.99 cannot be configured on PPC Mac OS X 10.4.11 because "/usr/bin/gzip has 3 other links"

[MacPorts]

#43245: Port 2.2.99 cannot be configured on PPC Mac OS X 10.4.11 because
"/usr/bin/gzip has 3 other links"
------------------------------+--------------------------------
  Reporter:  Peter_Dyballa@…  |      Owner:  macports-tickets@…
      Type:  defect           |     Status:  new
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.2.99
Resolution:                   |   Keywords:
      Port:  MacPorts         |
------------------------------+--------------------------------

Comment (by cal@…):

 Ugh, OK, so it seems we cannot set `_POSIX_C_SOURCE` on 10.4. So, we'll
 probably need a check for `Availability.h`, include that, then have an
 `#if` checking for the Mac OS X platform version and avoid defining
 `_POSIX_C_SOURCE` on 10.4. Alternatively, we could repeat the definitions
 of the macros and the declaration of the function.

-- 
Ticket URL: <https://trac.macports.org/ticket/43245#comment:15>
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