more makefile tennis

Makefile.win

@@ -25,7 +25,7 @@ ifeq (${FD_OUTPUT}, 1)
 FILTER=sed '/File/{ N; s/File "\([^"]\+\)", line \([0-9]\+\), characters \([0-9-]\+\):[\r\n]*\(.*\)/\1:\2: characters \3 : \4/ }' tmp.cmi
 endif
 
-ifdef ${FILTER}
+ifdef FILTER
 CC_CMD=($(OCAMLOPT) $(CFLAGS) -c $< 2>tmp.cmi && $(FILTER)) || ($(FILTER) && exit 1)
 CC_PARSER_CMD=($(OCAMLOPT) -pp camlp4o $(CFLAGS) -c parser.ml 2>tmp.cmi && $(FILTER)) || ($(FILTER) && exit 1)
 endif