--- a/dwt/internal/Library.d	Mon May 05 00:12:38 2008 +0200
+++ b/dwt/internal/Library.d	Sat May 17 17:34:28 2008 +0200
@@ -34,7 +34,7 @@
     /**
      * DWT Minor version number (must be in the range 0..999)
      */
-    static const int MINOR_VERSION = 349;
+    static const int MINOR_VERSION = 442;
 
     /**
      * DWT revision number (must be >= 0)
@@ -178,6 +178,20 @@
  * @param mapName true if the name should be mapped, false otherwise
  */
 public static void loadLibrary (String name, boolean mapName) {
+    String prop = System.getProperty ("sun.arch.data.model"); //$NON-NLS-1$
+    if (prop is null) prop = System.getProperty ("com.ibm.vm.bitmode"); //$NON-NLS-1$
+    if (prop !is null) {
+        if ("32".equals (prop)) { //$NON-NLS-1$
+             if (0x1FFFFFFFFL is (int /*long*/)0x1FFFFFFFFL) {
+                throw new UnsatisfiedLinkError ("Cannot load 64-bit DWT libraries on 32-bit JVM"); //$NON-NLS-1$
+             }
+        }
+        if ("64".equals (prop)) { //$NON-NLS-1$
+            if (0x1FFFFFFFFL !is (int /*long*/)0x1FFFFFFFFL) {
+                throw new UnsatisfiedLinkError ("Cannot load 32-bit DWT libraries on 64-bit JVM"); //$NON-NLS-1$
+            }       
+        }
+    }
 
     /* Compute the library name and mapped name */
     String libName1, libName2, mappedName1, mappedName2;