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/macOS/mac_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_mac.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 r = c.R * c.A / 255;
+							int g = c.G * c.A / 255;
+							int b = c.B * c.A / 255;
+							int p = (r << 24) | (g << 16) | (b << 8) | c.A;
+							sw.Write("0x" + ((uint)p).ToString("X8") + ",");
+						}
+						sw.WriteLine();
+					}
+				}
+			}
+		}
+		
+		public static void Main(string[] args) {
+			using (StreamWriter sw = new StreamWriter(dst)) {
+				sw.WriteLine("/* Generated using misc/macOS/mac_icon_gen.cs */");
+				sw.WriteLine("");
+				sw.WriteLine("static const unsigned int CCIcon_Data[] = {");
+				DumpIcon(sw, 64, 64);
+				sw.WriteLine("};");
+				sw.WriteLine("static const int CCIcon_Width  = 64;");
+				sw.WriteLine("static const int CCIcon_Height = 64;");
+			}
+		}
+	}
+}