diff --git a/libdap-stream-ch-vpn b/libdap-stream-ch-vpn
new file mode 160000
index 0000000000000000000000000000000000000000..722b9ed9866b34c8b117b76a7be61723351d20ad
--- /dev/null
+++ b/libdap-stream-ch-vpn
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+Subproject commit 722b9ed9866b34c8b117b76a7be61723351d20ad