I'm sure this is in progress, but adding it here for posterity.
Building AudioKit 4.10.1 (latest) fails in Xcode 12 beta 1.

oh we have been working on this for months lol
FWIW, I am _very_ grateful for all the work you all put into this.
Well, fyi, the v5-develop branch builds just fine in Xcode 12.
That is great to know. I'll check it out!
Well, iOS built, macOS might require some fixes which I'll try to do now.
Fixed the macOS issue I think, v5-develop now builds on all platforms.
FWIW, v4-develop worked for me too.
Is this for the Xcode that builds for hardware that doesn't exist yet?
I hadn't tried any of the dev branches. We have a cocoapod that uses 4.10.1 as a dependency which was having the problem. I was using just the normal Xcode 12 (12A6159). Just trying the same pod with 5.0.b1
Got it working with 5.0.b1 as a dependency instead of 4.10.1. Thanks for the heads up about that. Looks like I just have some iOS 14 hiccups to work through now, but the app is at least up and running. Thanks!
Cool!
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FWIW, I am _very_ grateful for all the work you all put into this.