[MacPorts] #57712: pulseaudio: using incorrect sysroot

[MacPorts]

#57712: pulseaudio: using incorrect sysroot
-------------------------+----------------------
  Reporter:  sgrewe      |      Owner:  Ionic
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.5.4
Resolution:              |   Keywords:  mojave
      Port:  pulseaudio  |
-------------------------+----------------------

Comment (by jmroot):

 If /usr/include exists, it is assumed to contain a working set of system
 headers and an SDK is not used. The code that sets the default value of
 configure.sdkroot is here: https://github.com/macports/macports-
 base/blob/v2.5.4/src/port1.0/portconfigure.tcl#L401

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Ticket URL: <https://trac.macports.org/ticket/57712#comment:6>
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