Index: vtkConfigure.h.in
===================================================================
RCS file: /cvsroot/VTK/VTK/vtkConfigure.h.in,v
retrieving revision 1.53
diff -u -3 -r1.53 vtkConfigure.h.in
--- vtkConfigure.h.in	9 Jun 2006 12:18:37 -0000	1.53
+++ vtkConfigure.h.in	2 Nov 2006 21:31:38 -0000
@@ -21,7 +21,20 @@
 /* Platform Features                                                        */
 
 /* Byte order.  */
+/* All compilers that support Mac OS X, and (I believe) gcc on any platform,
+   define either __BIG_ENDIAN__ or __LITTLE_ENDIAN__ to match the endianness
+   of the architecture being compiled for. This is not necessarily the same
+   as the architecture of the machine doing the building. In order to better
+   support cross-compilation, and Universal Binaries on Mac OS X in
+   particular, we prefer those defines to decide the endianness.  As a last
+   resort, we use the endianess of the building machine. */
+#if defined(__BIG_ENDIAN__)
+# define VTK_WORDS_BIGENDIAN
+#elif defined(__LITTLE_ENDIAN__)
+# undef VTK_WORDS_BIGENDIAN
+#else
 #cmakedefine VTK_WORDS_BIGENDIAN
+#endif
 
 /* Threading system.  */
 #cmakedefine VTK_USE_PTHREADS