Quoting Malte from msg8060:
Information by Felipe Meneguzzi on how to run multiple Mac OS versions on the
same machine, posted to the icaps-council list on November 6, 2018:
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About multiple machines, it just so happens that I started the process of
compiling FD in Sierra, and once I got it working, I decided to upgrade to
Mojave to see if some other issues with my computer and multiple screens were
sorted out (they did not, but at least it did not break the compilation of FD in
the process).
Now, as for testing multiple OSX versions, I haven’t tried it myself, but I
understand you can probably use vagrant and virtual box to build VMs for that in
the same physical machine (at the cost of substantial disk space):
https://app.vagrantup.com/AndrewDryga/boxes/vagrant-box-osx/
I think that, given the desktop flavour of virtually all Mac OS boxes most
people use, supporting just the last, or last two versions of OSX is probably
more than enough.
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I agree with the last sentence, but I think "last two" would be better than
"last", in which case this question comes up.
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