title: Swift Package Manager - UIKit Dependency
body: <p>I have a Package.swift in my project like:</p>
  <pre><code>import PackageDescription
  
  let package = Package(
      name: &quot;ProjectName&quot;,
          dependencies: [
             .Package(url: &quot;https://github.com/example/repo.git&quot;, majorVersion: 0)
          ]
   )
  </code></pre>
  <p>When I run <code>swift build</code> I get errors like…</p>
  <pre><code>/project/Packages/WebViewController.swift:1:8: error: no such module 'UIKit'
  import UIKit
         ^
  </code></pre>
  <p>Where should I tell the swift package manager where to find UIKit?</p>