[MacPorts] #50800: cairo, cairo-devel: fix for build failures against Xcode 7.3 linker when /usr/local/lib is absent

[MacPorts]

#50800: cairo, cairo-devel: fix for build failures against Xcode 7.3 linker when
/usr/local/lib is absent
------------------------------------+------------------------
  Reporter:  howarth.at.macports@…  |      Owner:  ryandesign
      Type:  defect                 |     Status:  new
  Priority:  Normal                 |  Milestone:
 Component:  ports                  |    Version:  2.3.4
Resolution:                         |   Keywords:  haspatch
      Port:  cairo, cairo-devel     |
------------------------------------+------------------------

Comment (by kencu):

 This same error occurs for other reasons that cause linker warnings as
 well. It appears that anything that throws a linker warning causes the
 pthread tests to fail, and that in turn causes the `error: "XXX: No mutex
 implementation found.` error above.

 I just patched this out today building cairo +universal on mojave (where
 the warning is presumably that i386 is deprecated).

 see also

 <https://bugs.freedesktop.org/show_bug.cgi?id=30910>

 and

 <https://bugs.freedesktop.org/show_bug.cgi?id=33417>

-- 
Ticket URL: <https://trac.macports.org/ticket/50800#comment:4>
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