$ pbpaste import UIKit protocol Component: UIView { associatedtype Model func activate(with model: Model) func deactivate() } class ImageComponent: UIImageView, Component { typealias Model = UIImage func activate(with model: ImageComponent.Model) { image = model } func deactivate() { image = nil } $ pbpaste|swiftc -sdk $(xcrun -show-sdk-path -sdk iphonesimulator) -target x86_64-apple-ios12.2-simulator - -v Apple Swift version 5.0.1 (swiftlang-1001.0.82.4 clang-1001.0.46.5) Target: x86_64-apple-ios12.2-simulator /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -frontend -c -primary-file - -target x86_64-apple-ios12.2-simulator -enable-objc-interop -sdk /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator12.2.sdk -color-diagnostics -module-name main -o /var/folders/kt/2mwy9b_56_7993x190pl_1fh0000gn/T/--eec0d7.o /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld /var/folders/kt/2mwy9b_56_7993x190pl_1fh0000gn/T/--eec0d7.o /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/clang/lib/darwin/libclang_rt.ios.a -syslibroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator12.2.sdk -lobjc -lSystem -arch x86_64 -L /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/iphonesimulator -ios_simulator_version_min 12.2.0 -no_objc_category_merging -o main $ ./main dyld: Library not loaded: /System/Library/Frameworks/UIKit.framework/UIKit Referenced from: /Users/norio/github/docker-swift/./main Reason: image not found [1] 91007 abort ./main