[MacPorts] #53862: xorg-libXt @1.1.5: autom4te: need GNU m4 1.4 or later: /usr/bin/m4

[MacPorts]

#53862: xorg-libXt @1.1.5: autom4te: need GNU m4 1.4 or later: /usr/bin/m4
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  Reporter:  sau1978     |      Owner:  jeremyhu
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.4.1
Resolution:              |   Keywords:
      Port:  xorg-libXt  |
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Comment (by sau1978):

 I tried several times to reinstall xorg-libXt with +flat_namespace and
 cleaned the port as Ken suggested but but with no success. Should I then
 just install grace as suggested: sudo port -v install grace +universal.
 Not sure if this is worth mentioning, but the laptops I'm trying to
 install on is a new MBPRD (2016) with Sierra. I have 3, other laptops
 (MBPRD 2012-El Capitan; MBAir 2015-El Capitan; MBP 2012-Sierra) which
 installed Grace successfully.

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Ticket URL: <https://trac.macports.org/ticket/53862#comment:6>
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