diff --git a/Package.swift b/Package.swift
index 8f7bf1e..e286069 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,3 +1,5 @@
+// swift-tools-version:5.0
+//
 // Package.swift
 // Copyright (c) 2017 Nicholas Maccharoli
 //
@@ -18,9 +20,18 @@
 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 // SOFTWARE.
-
 import PackageDescription
 
 let package = Package(
-    name: "UIDeviceComplete"
+    name: "UIDeviceComplete",
+    platforms: [
+        .iOS(.v8)
+    ],
+    products: [
+        .library(name: "UIDeviceComplete", targets: ["UIDeviceComplete"])
+    ],
+    targets: [
+        .target(name: "UIDeviceComplete", path: "Sources"),
+    ],
+    swiftLanguageVersions: [.v5]
 )
diff --git a/Sources/Screen.swift b/Sources/Screen.swift
index d9acca7..9cfe936 100644
--- a/Sources/Screen.swift
+++ b/Sources/Screen.swift
@@ -21,6 +21,8 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 // SOFTWARE.
 
+import UIKit
+
 public struct Screen {
     init(width: Double, height: Double, scale: Double) {
         self.width = width
diff --git a/Sources/System.swift b/Sources/System.swift
index cecd852..a83fe81 100644
--- a/Sources/System.swift
+++ b/Sources/System.swift
@@ -21,6 +21,8 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 // SOFTWARE.
 
+import Foundation
+
 class System {
     static var name: String? {
         var systemInfo = utsname()