[MacPorts] #57635: yelp fails to build on macOS 10.14

[MacPorts]

#57635: yelp fails to build on macOS 10.14
------------------------+--------------------
 Reporter:  carlofdtam  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.5.4
 Keywords:              |       Port:  yelp
------------------------+--------------------
 Command execution failed error when installing the yelp port

 Error: Failed to build yelp: command execution failed
 DEBUG: Error code: CHILDSTATUS 21780 2
 DEBUG: Backtrace: command execution failed
 DEBUG:     while executing
 DEBUG: "system {*}$notty {*}$nice $fullcmdstring"
 DEBUG:     invoked from within
 DEBUG: "command_exec build"
 DEBUG:     (procedure "portbuild::build_main" line 8)
 DEBUG:     invoked from within
 DEBUG: "$procedure $targetname"

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Ticket URL: <https://trac.macports.org/ticket/57635>
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