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

[MacPorts]

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

Comment (by ryandesign):

 Replying to [comment:6 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 this package will always fail when using port upgrade outdated and require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 calling upgraded outdated again.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 run upgrade outdated and both pymol and tk are upgraded, pymol will fail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 upgrade outdated again which is very annoying.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.

 I don't understand these remarks. MacPorts preserves your variant
 selections across upgrades. pymol does require that tk is installed
 without the quartz variant, so to fix that, you run `sudo port install tk
 -quartz` * once and you're done. MacPorts will remember that for any
 future upgrades of tk.

 (*When this ticket was filed, +quartz was a default variant of tk. That
 was [changeset:0363e864258a06b1ad878885dc8bf792083b7599/macports-ports
 changed] a few years ago and now +x11 is a default variant of tk.)

 MacPorts didn't used to preserve ''deselected'' variants across upgrades
 but that was [ticket:2377 fixed] in MacPorts 1.9.0 which had already been
 out for over a year when this ticket was filed.

 For this specific case, it would be a better investment of time to fix
 pymol so that it does not have the tk/tcl variant restrictions that it
 has.

-- 
Ticket URL: <https://trac.macports.org/ticket/30328#comment:9>
MacPorts <https://www.macports.org/>
Ports system for macOS