IPv6 Support Error Message ("not supported")

OpenConnect (v8.04) when connecting to our corporate VPN asked me to report this:

Potential IPv6-related GlobalProtect config tag <gw-address-v6>: 2001:67c:2388::2ee8:e584
This build does not support GlobalProtect IPv6 due to a lack of
of information on how it is configured. Please report this
to <openconnect-devel@lists.infradead.org>.
Potential IPv6-related GlobalProtect config tag <dns-v6>: 
			10.8.4.10
			10.8.4.20
			2001:67c:2388:102:0:111:0:10
			2001:67c:2388:102:0:111:0:20
		
This build does not support GlobalProtect IPv6 due to a lack of
of information on how it is configured. Please report this
to <openconnect-devel@lists.infradead.org>.
Potential IPv6-related GlobalProtect config tag <access-routes-v6>: 
			2001:67c:2388::/48
		
This build does not support GlobalProtect IPv6 due to a lack of
of information on how it is configured. Please report this
to <openconnect-devel@lists.infradead.org>.
Potential IPv6-related GlobalProtect config tag <exclude-access-routes-v6>: 
		
This build does not support GlobalProtect IPv6 due to a lack of
of information on how it is configured. Please report this
to <openconnect-devel@lists.infradead.org>.