Hi, the fix in the upstream repository for this issue is here:
ovpn-dco: add missing include for MODULE_ALIAS_GENL_FAMILY https://github.com/OpenVPN/ovpn-dco/commit/4a58dbe09278f76bfef9e6f20638a53345fca9cd Works fine on Debian trixie with custom 6.10.5 kernel. Regards Gerald