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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.