Clean autom4te.cache.

diff --git a/.cvsignore b/.cvsignore
index 859b105..38068e2 100644
--- a/.cvsignore
+++ b/.cvsignore
@@ -1,5 +1,6 @@
 Make.rules
 Makefile
+autom4te.cache
 config.cache
 config.log
 config.status