Macos builds take so much longer than linux ones

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For example, this one.

The linux job ran in < 2 minutes compared to 13 minutes for macos!

Glancing at the logs, it seems part of the trouble lies with brew - and its insistence on installing (among other things):

  • qt
  • cairo
  • python ( ?! )

I guess I have a couple questions:

  1. Is this something we’re causing, or is it the case for macos more generally?
  2. If it’s us, what can we do to cut the build times?
  3. If if’s Travis-related, how can we escalate this for them to take a look at?