[MacPorts] #67035: gr-osmosdr fail to build with +iio in macOS 10.15.7

[MacPorts]

#67035: gr-osmosdr fail to build with +iio in macOS 10.15.7
------------------------+------------------------
 Reporter:  YesNo801    |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:  gr-osmosdr  |       Port:  gr-osmosdr
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 command to install and build:

 $ sudo port install gr-osmosdr +iio

 ...

 Fetching archive for gr-iio
 ...
 --->  Fetching distfiles for gr-osmosdr
 --->  Verifying checksums for gr-osmosdr
 --->  Extracting gr-osmosdr
 --->  Applying patches to gr-osmosdr
 --->  Configuring gr-osmosdr

 Error: Failed to configure gr-osmosdr: consult Error: Processing of port
 gr-osmosdr failed

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Ticket URL: <https://trac.macports.org/ticket/67035>
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