Index: /trunk/doc/Makefile
===================================================================
--- /trunk/doc/Makefile	(revision 133)
+++ /trunk/doc/Makefile	(revision 134)
@@ -11,4 +11,6 @@
 clean :
 	$(RM) *.log *.dvi *.aux *.toc *.log *.out *~ core
+
+empty : clean
 	@for f in `find . -maxdepth 1 -name *.pdf`; do \
 	    if [ -f `echo $$f | sed 's/pdf/tex/'` ]; then \