M1 Mac/ ARM: SquareReaderSDK for iOS/iPadsOS Xcode Projects to compile on M1 Macs

I was able to get this to build on my M1 Macbook Pro using this workaround.

Step 1.
Add -target x86_64-apple-darwin to Other C Flags in Xcode

Step 2.
Add arm64 to excluded frameworks in Xcode