[MacPorts] #62172: fftw-3 @3.3.8_1+gfortran: Uses wrong SDK

[MacPorts]

#62172: fftw-3 @3.3.8_1+gfortran: Uses wrong SDK
------------------------+---------------------------------
  Reporter:  murrayE    |      Owner:  MarcusCalhoun-Lopez
      Type:  defect     |     Status:  closed
  Priority:  Normal     |  Milestone:
 Component:  base       |    Version:  2.6.99
Resolution:  duplicate  |   Keywords:
      Port:  fftw-3     |
------------------------+---------------------------------

Comment (by murrayE):

 In `/Library/Developer/CommandLineTools/SDKs` I find `MacOSX10.14.sdk`,
 `MacOSX10.15.sdk`, `MacOSX11.0.sdk`, and `MacOSX11.1.sdk`. Also
 `MacOSX.sdk`, which is an alias for `MacOSX11.1.sdk`.

 Whereas `MacOSX11.1.sdk` consists of some 42,000 items taking 312 MB on
 disk, `MacOSX11.0.sdk` consists of only 382 items taking 3.4 MB on disk.

 The other two, `MacOSX10.14.sdk`and `MacOSX10.15.sdk` are similar in
 number of files and size to `MacOSX11.1.sdk`.

 Is it totally safe to delete the entire `MacOSX11.0.sdk` directory?

 Should I also delete the older two, too?

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Ticket URL: <https://trac.macports.org/ticket/62172#comment:3>
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