[MacPorts] #53259: Error: xorg-libxcb: Variant python27 conflicts with python35

[MacPorts]

#53259: Error: xorg-libxcb: Variant python27 conflicts with python35
--------------------------+----------------------
  Reporter:  ClausKlein   |      Owner:  jeremyhu
      Type:  defect       |     Status:  reopened
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:  2.3.5
Resolution:               |   Keywords:
      Port:  xorg-libxcb  |
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Comment (by jmroot):

 Replying to [comment:7 jeremyhu]:
 > I wonder if this is because you previously got the +python27 variant
 because we hadn't yet added a python35 variant.  Then when you went to
 upgrade, you chose to honor variants and got both somehow?

 I think the most likely scenario is that the port was installed with
 +python27 and then +python35 was added to variants.conf. The former is
 preserved on upgrade (as intended) and the latter is also applied (because
 it's applied to all ports, also as intended), resulting in a conflict.

 If +python27 was explicitly requested the first time, there's no way to
 know which of the conflicting variants the user really wants. If it was
 implicitly added by default_variants, then there is not so much a bug as a
 missing feature: #46956.

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Ticket URL: <https://trac.macports.org/ticket/53259#comment:10>
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