error: terminated(72): xcrun --sdk macosx --find xctest output:

[mrtnkl]

Got this build error. Turns out it was due to using Xcode Beta. Found the solution here, which was setting the beta to be default:

PerfectlySoft/Perfect#262 (comment)

sudo xcode-select -s /Applications/Xcode-beta.app/Contents/Developer

Posting it here in case someone else has this issue.

[dnvriend]

Thanks, although I had to change it to:

sudo xcode-select -s /Applications/Xcode.app/Contents/Developer

[sjchoice]

Thank you. I'd like to also add in case someone else has this issue, that I could not get "export TOOLCHAINS=swift" to change to the latest Swift 5.0 development toolchain until I did this first, so thank you very much.

[elizabethsiegle]

Thank you!!