Rotate module dep graph

etc/Makefile.doc.template

@@ -3,6 +3,9 @@
 # Date:   11 Sep 2010
 # Descr:  Makefile for @PROJECT@ docs
 
+# The scripts used to make the graphs require the program dot; this
+# is part of the graphviz package.
+
 DEL = rm
 
 all: file_dependencies.pdf module_dependencies.pdf makefile_dependencies.pdf build_dependencies.pdf callgraph.pdf
@@ -11,7 +14,7 @@ file_dependencies.pdf: files.d
 	../../../etc/graphdeps.py $< --out $@
 
 module_dependencies.pdf: modules.d 
-	../../../etc/graphdeps.py $< --modules --out $@
+	../../../etc/graphdeps.py $< --modules --rotate --out $@
 
 makefile_dependencies.pdf: ../Makefile
 	../../../etc/graphdeps.py $< --out $@