Yes, Brad has just added that undef to itkWin32Header.h, so if you do an update, you may be able to get rid of the include of itkWindows.h altogether. -Bill At 10:58 AM 3/1/2001 -0500, Luis Ibanez wrote: >Is that because of the #undef GetClassName in itkWindows.h ? > >Thanks, > >Luis