[MacPorts] #42131: gnuplot: configure: error: cannot run C compiled programs

[MacPorts]

#42131: gnuplot: configure: error: cannot run C compiled programs
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  Reporter:  netja000@…  |      Owner:  mojca@…
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.2.1
Resolution:              |   Keywords:
      Port:  gnuplot     |
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Comment (by netja000@…):

 Thank for your replies.

 I just attached the config.log. I also attached the screenshot of the
 Xcode's preference, which shows that the Xcode command line tools
 installed and no updates can be found.

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Ticket URL: <https://trac.macports.org/ticket/42131#comment:3>
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