Index: doc/Makefile.am
===================================================================
--- doc/Makefile.am	(revision 584720)
+++ doc/Makefile.am	(working copy)
@@ -32,4 +32,4 @@
 docs: html/index.en.html html/rivet.en.html
 
 clean:
-	rm html/*.html
\ No newline at end of file
+	-rm html/*.html