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$NetBSD: patch-aa,v 1.6 2006/08/01 14:33:59 jmmv Exp $

--- docs/users_guide/Makefile.in.orig	2006-04-28 14:24:16.000000000 +0200
+++ docs/users_guide/Makefile.in
@@ -78,12 +78,13 @@ pdf: $(ROOT).pdf
 htmlhelp: $(ROOT).chm
 
 $(HTML): $(SGML_FILES) $(DSL_FILE) $(CSS_FILE)
-	$(RM) -r $(ROOT)
-	mkdir $(ROOT)
-	$(CP) $(CSS_FILE) $(ROOT)
-	$(CP) $(IMAGE) $(ROOT)
-	test -z '$(DOCBOOK2HTML)' || \
-	  $(DOCBOOK2HTML) --dsl $(DSL_FILE) $(ROOT).sgml
+	if test -n '$(DOCBOOK2HTML)'; then \
+		$(RM) -r $(ROOT); \
+		mkdir $(ROOT); \
+		$(CP) $(CSS_FILE) $(ROOT); \
+		$(CP) $(IMAGE) $(ROOT); \
+		$(DOCBOOK2HTML) --dsl $(DSL_FILE) $(ROOT).sgml; \
+	fi
 
 $(ROOT).dvi: $(SGML_FILES)
 	test -z '$(DOCBOOK2DVI)' || $(DOCBOOK2DVI) $(ROOT).sgml