-SGML_DVI = $(addsuffix .dvi, $(basename $(SGML_SRCS)))
-SGML_PS = $(addsuffix .ps, $(basename $(SGML_SRCS)))
-SGML_INFO = $(addsuffix .info, $(basename $(SGML_SRCS)))
-SGML_HTML = $(addsuffix .html, $(basename $(SGML_SRCS)))
-SGML_TEXT = $(addsuffix .txt, $(basename $(SGML_SRCS)))
+SGML_DVI = $(SGML_DOC).dvi
+SGML_PS = $(SGML_DOC).ps
+SGML_INFO = $(SGML_DOC).info
+SGML_HTML = $(SGML_DOC).html
+SGML_TEXT = $(SGML_DOC).txt