Latest compatible version of Classicube from the original GitHub repository (https://github.com/ClassiCube/ClassiCube) that can be compiled on Classicube for PowerMac PPC running Mac OS X 10.4.

misc/sdl/sdl_icon_gen.cs

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+using System.Drawing.Imaging;
+using System.Drawing;
+using System.IO;
+
+namespace test 
+{
+	public static class Program 
+	{
+		const string src = "CCicon.ico";
+		const string dst = "CCIcon_SDL.h";
+		
+		static void DumpIcon(StreamWriter sw, int width, int height) {
+			using (Icon icon = new Icon(src, width, height)) {
+				using (Bitmap bmp = icon.ToBitmap()) {
+					for (int y = 0; y < bmp.Height; y++) {
+						for (int x = 0; x < bmp.Width; x++) {
+							Color c = bmp.GetPixel(x, y);
+							int p = (c.A << 24) | (c.R << 16) | (c.G << 8) | c.B;
+							sw.Write("0x" + ((uint)p).ToString("X8") + ",");
+						}
+						sw.WriteLine();
+					}
+				}
+			}
+			sw.WriteLine("static const int CCIcon_Width  = {0};", width);
+			sw.WriteLine("static const int CCIcon_Height = {0};", height);
+			sw.WriteLine("static const int CCIcon_Pitch  = {0};", width * 4);
+		}
+		
+		public static void Main(string[] args) {
+			using (StreamWriter sw = new StreamWriter(dst)) {
+				sw.WriteLine("/* Generated using misc/sdl/sdl_icon_gen.cs */");
+				sw.WriteLine("");
+				sw.WriteLine("static const unsigned CCIcon_Data[] = {");
+				DumpIcon(sw, 64, 64);
+				sw.WriteLine("};");
+			}
+		}
+	}
+}