Ignore 'build' and 'Makefile.pre'.
diff --git a/.cvsignore b/.cvsignore
index 04a4a99..ceb8a91 100644
--- a/.cvsignore
+++ b/.cvsignore
@@ -6,3 +6,5 @@
 Makefile
 buildno
 python
+build
+Makefile.pre