Remove a few more things in the distclean target to get rid of *all* generated files.
diff --git a/Makefile.am b/Makefile.am
index 07e610d..7f1abb1 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -68,4 +68,5 @@
 
 distclean-local:
 	-rm -rf $(testsubdir)
+	-rm -rf config.h.in~ Makefile.in aclocal.m4 autom4te.cache/ config.guess config.sub configure depcomp install-sh ltmain.sh missing