[MacPorts] #61720: gwyddion: Undefined symbols for architecture x86_64

[MacPorts]

#61720: gwyddion: Undefined symbols for architecture x86_64
------------------------+----------------------
  Reporter:  btywoniuk  |      Owner:  rowue
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.4
Resolution:             |   Keywords:  bigsur
      Port:  gwyddion   |
------------------------+----------------------

Comment (by nirjharize):

 Xcode12.5
 Build version 12E5234g

 When I run "port configure gwyddion" it gives me the same following error.

 Warning: The macOS 11.2 SDK does not appear to be installed. Ports may not
 build correctly.
 Warning: You can install it as part of the Xcode Command Line Tools
 package by running `xcode-select --install'

 I get the error CLTs are already installed when i run `xcode-select
 --install'

 When I look up the folder /Library/Developer/CommandLineTools/SDKs/ or
 /Applications/Xcode-
 beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/
 I see only MacOSX10.15.sdk and MacOSX11.3.sdk.

-- 
Ticket URL: <https://trac.macports.org/ticket/61720#comment:13>
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