[MacPorts] #60851: libiio fails to build under MacOS 10.14.6

[MacPorts]

#60851: libiio fails to build under MacOS 10.14.6
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  Reporter:  mcquiggi  |      Owner:  michaelld
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.2
Resolution:            |   Keywords:
      Port:  libiio    |
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Comment (by michaelld):

 Looks like you have an alternative iio install as
 `/Library/Frameworks/iio.framework/iio`. Do you know how this got there?
 As it's in a macOS-standard search path (`/Library/Frameworks/`), CMake is
 finding it. If you don't need it, I'd recommend getting rid of it. Then
 you'll need to do:
 {{{
 sudo port clean libiio
 }}}
 before trying to install it again.

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Ticket URL: <https://trac.macports.org/ticket/60851#comment:7>
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