Provide dummy implementations for classes not available on the iPhone.

Source/OpenTK/Minimal.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace OpenTK
+{
+    // Override a number of System.* classes when compiling for
+    // minimal targets (e.g. MonoTouch).
+    // Note: the "overriden" classes must not be fully qualified for this to work!
+
+#if IPHONE
+    // System.Diagnostics.Debug
+    static class Debug
+    {
+        public static void Write(string message) { }
+        public static void Write(object obj) { }
+        public static void WriteLine(string message) { }
+        public static void WriteLine(object obj) { }
+        public static void Print(string message) { }
+        public static void Print(string format, params object[] args) { }
+        public static void Indent() { }
+        public static void Unindent() { }
+        public static void Flush() { }
+    }
+
+    // System.Diagnostics.Trace
+    static class Trace
+    {
+        public static void Write(string message) { }
+        public static void Write(object obj) { }
+        public static void WriteLine(string message) { }
+        public static void WriteLine(object obj) { }
+        public static void Indent() { }
+        public static void Unindent() { }
+        public static void Flush() { }
+    }
+
+    // System.Diagnostics.Stopwatch
+    sealed class Stopwatch
+    {
+        DateTime start, stop;
+        bool running;
+
+        public void Reset()
+        {
+            start = stop = DateTime.MinValue;
+            running = false;
+        }
+
+        public void Start()
+        {
+            start = DateTime.Now;
+            running = true;
+        }
+
+        public void Stop()
+        {
+            stop = DateTime.Now;
+            running = false;
+        }
+
+        public TimeSpan Elapsed
+        {
+            get
+            {
+                if (running)
+                    return TimeSpan.FromTicks(DateTime.Now.Ticks - start.Ticks);
+                else
+                    return TimeSpan.FromTicks(stop.Ticks - start.Ticks);
+            }
+        }
+    }
+
+    // System.Xml.XmlIgnoreAttribute
+    class XmlIgnoreAttribute : Attribute
+    {
+    }
+
+    // System.ComponentModel.EditorBrowrableAttribute
+    class EditorBrowsableAttribute : Attribute
+    {
+        public EditorBrowsableAttribute(EditorBrowsableState state) { }
+    }
+
+    // System.ComponentModel.EditorBrowsableState
+    enum EditorBrowsableState
+    {
+        Always = 0,
+        Never = 1,
+        Advanced = 2,
+    }
+#endif
+}