--- a/configure.in
+++ b/configure.in
@@ -50,9 +50,9 @@
   AC_MSG_WARN([cannot find doxygen, unable to generate Cal3D API Reference!])
 fi
 
-AC_CHECK_PROG(DB2HTML, db2html, true, false)
+AC_CHECK_PROG(DB2HTML, docbook2html, true, false)
 if test "$DB2HTML" = false; then
-  AC_MSG_WARN([cannot find db2html, unable to generate Cal3D User's Guide!])
+  AC_MSG_WARN([cannot find docbook2html, unable to generate Cal3D User's Guide!])
 fi
 
 AC_PATH_PROG(BLENDER, [blender])
--- a/docs/Makefile.am
+++ b/docs/Makefile.am
@@ -18,7 +18,7 @@
 	doxygen cal3d.doxygen
 
 doc-guide:
-	db2html guide.sgml
+	docbook2html guide.sgml
 
 clean-local:
 	rm -rf guide guide.junk