[MacPorts] #61870: primegen @0.97_0 fails to build on Apple Silicon

[MacPorts]

#61870: primegen @0.97_0 fails to build on Apple Silicon
--------------------------+----------------------
 Reporter:  vespasian99   |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.6.4
 Keywords:  bigsur arm64  |       Port:  primegen
--------------------------+----------------------
 primegen build fails on Big Sur arm64: implicitly declaring 'printf',
 'exit'.

-- 
Ticket URL: <https://trac.macports.org/ticket/61870>
MacPorts <https://www.macports.org/>
Ports system for macOS