-void ustr_ucat(struct UString *dst, UChar c, UErrorCode *status);
-void ustr_uscat(struct UString *dst, const UChar* src,int len,UErrorCode *status);
+U_CFUNC void ustr_ucat(struct UString *dst, UChar c, UErrorCode *status);
+U_CFUNC void ustr_u32cat(struct UString *dst, UChar32 c, UErrorCode *status);
+U_CFUNC void ustr_uscat(struct UString *dst, const UChar* src,int len,UErrorCode *status);