[MacPorts] #57544: zstd @1.3.4: fails to compile for i386 on 10.6

[MacPorts]

#57544: zstd @1.3.4: fails to compile for i386 on 10.6
------------------------+------------------------
  Reporter:  LetterRip  |      Owner:  seanfarley
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.5.4
Resolution:             |   Keywords:
      Port:  zstd       |
------------------------+------------------------

Comment (by kencu):

 It wants `c++11`, so we need to configure the PG for that.

 It is also not passing the `-stdlib=NNN` so that needs to be fixed as
 well.

 With all this work to be done, we might as well update it first to 1.3.7,
 and then start fixing the broken bits after that.

-- 
Ticket URL: <https://trac.macports.org/ticket/57544#comment:4>
MacPorts <https://www.macports.org/>
Ports system for macOS