[MacPorts] #33259: cmake portgroup: out of source build option, possibly by default

[MacPorts]

#33259: cmake portgroup: out of source build option, possibly by default
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  Reporter:  ryandesign@…  |      Owner:  macports-tickets@…
      Type:  enhancement   |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:                |
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Comment (by cal@…):

 So, summing up, the above patch with `${worksrcpath}` instead of
 `../${worksrcdir}` should work in virtually all cases. Should we commit
 it?

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Ticket URL: <https://trac.macports.org/ticket/33259#comment:30>
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