diff --git a/Source/Bind/CL/CLGenerator.cs b/Source/Bind/CL/CLGenerator.cs
index 9545b5c4..2f56dfa8 100644
--- a/Source/Bind/CL/CLGenerator.cs
+++ b/Source/Bind/CL/CLGenerator.cs
@@ -15,7 +15,7 @@ namespace Bind.CL
             if (String.IsNullOrEmpty(name))
                 throw new ArgumentNullException("name");
 
-            glTypemap = "GL2/gl.tm";
+            glTypemap = null;
             csTypemap = "csharp.tm";
             
             enumSpec = name + "/signatures.xml";
diff --git a/Source/Bind/GL2/Generator.cs b/Source/Bind/GL2/Generator.cs
index 5754c064..599733dc 100644
--- a/Source/Bind/GL2/Generator.cs
+++ b/Source/Bind/GL2/Generator.cs
@@ -314,6 +314,9 @@ namespace Bind.GL2
             Console.WriteLine("Reading opengl types.");
             Dictionary<string, string> GLTypes = new Dictionary<string, string>();
 
+            if (specFile == null)
+                return GLTypes;
+
             do
             {
                 string line = specFile.ReadLine();
diff --git a/Source/Bind/Utilities.cs b/Source/Bind/Utilities.cs
index d07a3757..6be0d4e2 100644
--- a/Source/Bind/Utilities.cs
+++ b/Source/Bind/Utilities.cs
@@ -76,6 +76,9 @@ namespace Bind
 
         internal static StreamReader OpenSpecFile(string folder, string file)
         {
+            if (String.IsNullOrEmpty(folder) || String.IsNullOrEmpty(file))
+                return null;
+
             Console.WriteLine(folder);
             Console.WriteLine(file);
             string path = Path.Combine(folder, file);