diff --git a/Makefile b/Makefile
index 09455e5..f393d85 100644
--- a/Makefile
+++ b/Makefile
@@ -223,16 +223,16 @@ ZIC=		$(zic) $(ZFLAGS)
 AWK=		nawk
 
 # The path where SGML DTDs are kept.
-SGML_SEARCH_PATH= $(TOPDIR)/share/doc/sgml-lib/REC-xhtml1-20000126/
+SGML_SEARCH_PATH= $(TOPDIR)/share/doc/sgml-lib/REC-html401-19991224/
 
 # The catalog file(s) to use when validating XHTML.
-SGML_CATALOG_FILES= xhtml.soc
+SGML_CATALOG_FILES= HTML4.cat
 
 # The name, arguments and environment of a program to validate your web pages.
 # See <http://www.jclark.com/sp/> for a validator, and
 # <http://validator.w3.org/source/> for a validation library.
 VALIDATE = nsgmls
-VALIDATE_FLAGS = -s -B -wall -wno-unused-param -wxml
+VALIDATE_FLAGS = -s -B -wall -wno-unused-param
 VALIDATE_ENV = \
   SGML_CATALOG_FILES=$(SGML_CATALOG_FILES) \
   SGML_SEARCH_PATH=$(SGML_SEARCH_PATH) \