I have a Package.swift in my project like:
import PackageDescription let package = Package( name: \"ProjectName\", dependencies: [ .P
You have to change some swiftc options to build the project against proper sdk and target
swift build -Xswiftc "-sdk" -Xswiftc "`xcrun --sdk iphonesimulator --show-sdk-path`" -Xswiftc "-target" -Xswiftc "x86_64-apple-ios13.0-simulator"