[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 mojca@…):

 If we change just `cmake-1.0.tcl`, we don't need to wait for a new
 release. But if we would introduce a global variable (that could also be
 used for `configure`-based projects), we might need an upgrade of base
 (not sure about that).

 Rene's last patch looks promising. I will test it on some of my ports.

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Ticket URL: <https://trac.macports.org/ticket/33259#comment:17>
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