[MacPorts] #57742: cairo @1.16.0 +quartz+universal+x11: cannot upgrade from @1.14.12 to @1.16.0

[MacPorts]

#57742: cairo @1.16.0 +quartz+universal+x11: cannot upgrade from @1.14.12 to
@1.16.0
---------------------------+------------------------
  Reporter:  hugo-ribeiro  |      Owner:  ryandesign
      Type:  defect        |     Status:  closed
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.5.4
Resolution:  fixed         |   Keywords:  xcode10
      Port:  cairo         |
---------------------------+------------------------

Comment (by ryandesign):

 Replying to [comment:17 kencu]:
 > But back when you first installed ld64 and cctools, the default variant
 was xcode; now it is not (should not be). But -- we don't have a simple
 way to bump you automatically up to the new preferred variants, so that is
 our failing. There is another ticket about that back in the 4000 series.

 Probably you're thinking of #46956.

 Replying to [comment:18 JDLH]:
 > Which variants should I have installed?  Reading `port info cctools
 ld64` tells me the list of variants which exist, but as far as I can see,
 it doesn't describe the variants, or say which is the default variant, or
 recommend which one people should have installed.

 Both `port info` and `port variants` tell you (with less and more level of
 detail, respectively) what variants are available and which ones will be
 selected by default. The ones that will be selected by default show`[+]`
 before their names. At the moment, on 10.13, the default variants for
 cctools are +llvm10 and the default variants for ld64 are no variants. You
 can receive these new defaults by asking MacPorts to install the ports
 again: `sudo port install cctools ld64`

 > And where should I be reading to find out this sort of information? I
 appreciate you two taking the time to explain things in this ticket, but
 that form of user education doesn't scale.

 The official documentation is at https://guide.macports.org. It likely
 does not include all of this information, though it does for example
 discuss [https://guide.macports.org/#using.variants variants and which
 ones are enabled or disabled by default]. Improvements to the guide are
 welcome. Discussion on the [https://lists.macports.org/mailman/listinfo
 mailing lists] is also a good place to learn things.

-- 
Ticket URL: <https://trac.macports.org/ticket/57742#comment:19>
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