[MacPorts] #54747: m4 @1.4.18_2 fails to build on MacOS 10.13

[MacPorts]

#54747: m4 @1.4.18_2 fails to build on MacOS 10.13
------------------------+--------------------
 Reporter:  rex4539     |      Owner:
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.4.99
 Keywords:  highsierra  |       Port:  m4
------------------------+--------------------


--
Ticket URL: <https://trac.macports.org/ticket/54747>
MacPorts <https://www.macports.org/>
Ports system for macOS