[MacPorts] #60414: qt513-qtbase-docs: (linux) failed to determine number of available CPUs

[MacPorts]

#60414: qt513-qtbase-docs: (linux) failed to determine number of available CPUs
--------------------+---------------------------------
 Reporter:  kencu   |      Owner:  MarcusCalhoun-Lopez
     Type:  defect  |     Status:  assigned
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.6.2
 Keywords:  linux   |       Port:  qt513-qtbase-docs
--------------------+---------------------------------
 {{{
 Warning: failed to determine the number of available CPUs (probably not
 supported on this platform)
 Warning: defaulting to 2 jobs, consider setting buildmakejobs to a nonzero
 value in macports.conf
 }}}

 when running PortIndex after installing MacPorts 2.6.2 on Ubuntu Linux
 20.04, this error is noted a number of times when parsing the Portfiles of
 various qt ports.

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Ticket URL: <https://trac.macports.org/ticket/60414>
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