if(BRLCAD_ENABLE_TK)
    BRLCAD_ADDEXEC(fbthreadtest fbthreadtest.c "libfb;${TCL_TK_LIBRARY}" NO_INSTALL)
  SET_TARGET_PROPERTIES(fbthreadtest PROPERTIES COMPILE_DEFINITIONS "IF_TK")
  SET_TARGET_PROPERTIES(fbthreadtest PROPERTIES LINKER_LANGUAGE C)
endif(BRLCAD_ENABLE_TK)