[MacPorts] #64116: libarchive @3.5.2: ld: library not found for -lgomp

[MacPorts]

#64116: libarchive @3.5.2: ld: library not found for -lgomp
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  Reporter:  catap       |      Owner:  tobypeterson
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.1
Resolution:              |   Keywords:  snowleopard
      Port:  libarchive  |
-------------------------+--------------------------

Comment (by kencu):

 It will probably be testing to see if the {{{-fopenmp}}} flag is
 supported, (which clang-9.0 does support, used by 10.6), and if it is
 then it will probably misfire and think it is running on gcc and force
 {{{-lgomp}}} in as the link library, which is wrong.

 But as only 0.0001% of MacOS users use compilers that support
 {{{-fopenmp}}} nobody will have debugged this before.

 We see something much the same happen with ImageMagick here #57009

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Ticket URL: <https://trac.macports.org/ticket/64116#comment:4>
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