[MacPorts] #58855: gnucash 3.5: config error -> build failure on Mohave

[MacPorts]

#58855: gnucash 3.5: config error -> build failure on Mohave
---------------------------+--------------------
  Reporter:  LenoreHorner  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.5.4
Resolution:                |   Keywords:
      Port:  gnucash       |
---------------------------+--------------------

Comment (by kencu):

 possibly useful <https://techoverflow.net/2019/06/20/how-to-fix-unknown-
 cmake-command-check_symbol_exists/>

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Ticket URL: <https://trac.macports.org/ticket/58855#comment:2>
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