macOS app Xcode project fails after pkl-swift

[arkavo-com]

Error:

Undefined symbols for architecture arm64:
  "_objc_addLoadImageFunc", referenced from:
      getMachHeaders()::$_0::operator()(void*) const in Discovery.o
ld: symbol(s) not found for architecture arm64
clang++: error: linker command failed with exit code 1 (use -v to see invocation)

macOS 15.1
M4
Xcode 16.1

Works when used in a swift app, fails in Xcode.

To reproduce:

• Create macOS app in Xcode
• add https://github.com/apple/pkl-swift as Package Dependencies
• build it

Note this is not iOS, it is macOS