This error, which typically goes on to say, "widget 11004 vs.
intrinsics 11003" indicates that the header files you included when building
your program didn't match the header files that the Xt library you're linking
against was built with; check your -I include path and -L link-path to be
sure.
	However, the problem also occurs when linking against a version of the
X11R4 Xt library before patch 10; the version number was wrong.  Some Sun OW
systems, in particular, were shipped with the flawed version of the library,
and applications which link against the library typically give the warnings
you have seen.