diff --git a/OSBindings/Mac/Clock Signal/AppDelegate.swift b/OSBindings/Mac/Clock Signal/AppDelegate.swift
index f54ae5faf..4b202f4cf 100644
--- a/OSBindings/Mac/Clock Signal/AppDelegate.swift	
+++ b/OSBindings/Mac/Clock Signal/AppDelegate.swift	
@@ -11,12 +11,24 @@ import Cocoa
 @NSApplicationMain
 class AppDelegate: NSObject, NSApplicationDelegate {
 
-	func applicationDidFinishLaunching(_ aNotification: Notification) {
+	private var failedMetalCheck = false
+	func applicationDidFinishLaunching(_ notification: Notification) {
 		// Insert code here to initialize your application.
-	}
 
-	func applicationWillTerminate(_ aNotification: Notification) {
-		// Insert code here to tear down your application.
+		// Check for at least one Metal-capable GPU; this check
+		// will become unnecessary if/when the minimum OS version
+		// that this project supports reascends to 10.14.
+		if (MTLCopyAllDevices().count == 0) {
+			self.failedMetalCheck = true
+
+			let alert = NSAlert()
+			alert.messageText = "This application requires a Metal-capable GPU"
+			alert.addButton(withTitle: "Exit")
+			alert.runModal()
+
+			let application = notification.object as! NSApplication
+			application.terminate(self)
+		}
 	}
 
 	private var hasShownOpenDocument = false