In order to make this latest version of VCV Rack build, I had to
use VCV's fork of the RtAudio library, which has diverged from the
official RtAudio releases. I also disabled parallel builds because
they seemed to be causing non-deterministic build failures.
It is possible that the VCV team will eventually make new releases
of Rack that can again be built against the latest official release
of RtAudio; if that ever happens we can stop packaging VCV Rack
wit its own version of the library.
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