Force CVS to create the lib/ directory by creating a file in it.
diff --git a/lib/CVS.IEXIST b/lib/CVS.IEXIST
new file mode 100644
index 0000000..866b5de
--- /dev/null
+++ b/lib/CVS.IEXIST
@@ -0,0 +1 @@
+This is here so CVS creates the directory, which would otherwise be empty.