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diff --git a/LibOVRKernel/Src/Util/Util_SystemGUI_OSX.mm b/LibOVRKernel/Src/Util/Util_SystemGUI_OSX.mm
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+/************************************************************************************
+
+Filename    :   Util_SystemGUI.mm
+Content     :   OS GUI access, usually for diagnostics.
+Created     :   October 20, 2014
+Copyright   :   Copyright 2014 Oculus VR, LLC All Rights reserved.
+
+Licensed under the Oculus VR Rift SDK License Version 3.2 (the "License"); 
+you may not use the Oculus VR Rift SDK except in compliance with the License, 
+which is provided at the time of installation or download, or which 
+otherwise accompanies this software in either electronic or hard copy form.
+
+You may obtain a copy of the License at
+
+http://www.oculusvr.com/licenses/LICENSE-3.2 
+
+Unless required by applicable law or agreed to in writing, the Oculus VR SDK 
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+*************************************************************************************/
+
+
+
+#include "Util_SystemGUI.h"
+
+#include <Cocoa/Cocoa.h>
+#include <CoreFoundation/CoreFoundation.h>
+
+
+namespace OVR { namespace Util {
+
+
+bool DisplayMessageBox(const char* pTitle, const char* pText)
+{
+    // To consider: Replace usage of CFUserNotificationDisplayAlert with something a little smarter.
+    
+    size_t         titleLength = strlen(pTitle);
+    size_t         textLength = strlen(pText);
+    if(textLength > 1500)   // CFUserNotificationDisplayAlert isn't smart enough to handle large text sizes and screws up its size if so.
+        textLength = 1500;  // Problem: this can theoretically split a UTF8 multibyte sequence. Need to find a divisible boundary.
+    CFAllocatorRef allocator = NULL;  // To do: support alternative allocator.
+    CFStringRef    titleRef = CFStringCreateWithBytes(allocator, (const UInt8*)pTitle, (CFIndex)titleLength, kCFStringEncodingUTF8, false);
+    CFStringRef    textRef  = CFStringCreateWithBytes(allocator, (const UInt8*)pText,  (CFIndex)textLength,  kCFStringEncodingUTF8, false);
+    CFOptionFlags  result;
+
+    CFUserNotificationDisplayAlert(0,               // No timeout
+                                   kCFUserNotificationNoteAlertLevel,
+                                   NULL,            // Icon URL, use default.
+                                   NULL,            // Unused
+                                   NULL,            // Localization of strings
+                                   titleRef,        // Title text
+                                   textRef,         // Body text
+                                   CFSTR("OK"),     // Default "OK" text in button
+                                   CFSTR("Cancel"), // Other button title
+                                   NULL,            // Yet another button title, NULL means no other button.
+                                   &result);        // response flags
+    CFRelease(titleRef);
+    CFRelease(textRef);
+    
+    return (result == kCFUserNotificationDefaultResponse);
+}
+
+
+} } // namespace OVR { namespace Util {
+
+