Add copyright.tex and boilerplate.tex to the common dependencies for .dvi
files.
diff --git a/Doc/Makefile b/Doc/Makefile
index cc20439..b9d22d8 100644
--- a/Doc/Makefile
+++ b/Doc/Makefile
@@ -93,7 +93,9 @@
 	$(DISTILL) $<
 
 # Dependencies
-tut.dvi lib.dvi ext.dvi api.dvi: myformat.sty fix_hack
+COMMONTEX=myformat.sty copyright.tex boilerplate.tex
+
+tut.dvi lib.dvi ext.dvi api.dvi: fix_hack $(COMMONTEX)
 
 # Tutorial document
 tut.dvi: tut.tex