--- a/doc/book/en/makefile	Mon Jan 24 09:42:09 2011 +0100
+++ b/doc/book/en/makefile	Mon Jan 24 11:39:53 2011 +0100
@@ -33,7 +33,7 @@
 
 clean:
 	rm -f *.html
-	-rm -rf ${BUILDDIR}/*
+	-rm -rf ${BUILDDIR}/html ${BUILDDIR}/doctrees
 	-rm -rf ${BUILDJS}
 
 all: html