--- ./Documentation/Makefile~	2009-07-29 17:18:18.000000000 +0900
+++ ./Documentation/Makefile	2009-09-03 15:41:44.000000000 +0900
@@ -231,7 +231,7 @@
 
 %.1 %.5 %.7 : %.xml
 	$(QUIET_XMLTO)$(RM) $@ && \
-	xmlto -m $(MANPAGE_XSL) $(XMLTO_EXTRA) man $<
+	xmlto --skip-validation -m $(MANPAGE_XSL) $(XMLTO_EXTRA) man $<
 
 %.xml : %.txt
 	$(QUIET_ASCIIDOC)$(RM) $@+ $@ && \