[MacPorts] #30328: Enable variants for specific ports in variants.conf

[MacPorts]

#30328: Enable variants for specific ports in variants.conf
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  Reporter:  ionic@…      |      Owner:  macports-tickets@…
      Type:  enhancement  |     Status:  new
  Priority:  Low          |  Milestone:
 Component:  base         |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by webmaster@…):

 Actually, there is a very good reason for this:
 If a package requires a dependency to be built with a certain variant,
 this package will always fail when using port upgrade outdated and require
 the dependency to be installed manually with the variant again before
 calling upgraded outdated again.

 For example: pymol requires tk to be installed with - quartz. Now if I run
 upgrade outdated and both pymol and tk are upgraded, pymol will fail and
 require me to install tk manually with -quartz. Then I need to run upgrade
 outdated again which is very annoying. Actually I believe this is the
 reason why gentoo introduced the per package configuration in the first
 place.

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Ticket URL: <https://trac.macports.org/ticket/30328#comment:6>
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