[MacPorts] #63008: libpng +universal build fails with "Undefined symbols for architecture arm64"

[MacPorts]

#63008: libpng +universal build fails with "Undefined symbols for architecture
arm64"
---------------------------+--------------------
  Reporter:  ShadSterling  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.1
Resolution:                |   Keywords:
      Port:  libpng        |
---------------------------+--------------------

Comment (by kencu):

 the 5-second fix was to add the muniversal PortGroup:
 {{{
 % port -v installed libpng
 The following ports are currently installed:
   libpng @1.6.37_0+universal (active) requested_variants='+universal'
 platform='darwin 20' archs='arm64 x86_64' date='2021-09-18T18:09:39-0700'
 }}}

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Ticket URL: <https://trac.macports.org/ticket/63008#comment:5>
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