-all-ps: $(addsuffix .ps, $(BOARDFILES))
-all-pdf: $(addsuffix .pdf, $(BOARDFILES))
+PSS=$(addsuffix .ps, $(BOARDFILES))
+PDFS=$(addsuffix .pdf, $(BOARDFILES))
+PREVIEWS=maxprintable-a3-preview.png
+
+all-ps: $(PSS)
+all-pdf: $(PDFS)
+all-preview: $(PREVIEWS)