There seems to be variants available, openvpn-nossl, openvpn-openssl and openvpn-polarssl. Maybe the -nossl variant is the normal OpenVPN ? Having a fiddle with the build system to see if I can fool it into thinking that the -nossl one is the right one to use.

8devices packages: Package: 6in4 Version: 23-1 Depends: libc, kmod-sit, uclient-fetch Source: package/network/ipv6/6in4 License: GPL-2.0 Section: net Maintainer: Jo-Philipp Wich OpenWRT 如何部署 OpenVPN Server？ - 知乎 如何在公司总部的路由器部署openvpn server 使各区域分公司能用vpn连公司呢？路由器系统是OpenWRT。 Automatically generated file; DO NOT EDIT. # OpenWrt CONFIG_DEFAULT_TARGET_OPTIMIZATION="-Os -pipe -mno-branch-likely -mips32r2 -mtune=24kec -mdsp"

OpenWrt Forum Archive

Mar 14, 2015 Index of /releases/packages-19.07/aarch64_generic/base/ File Name File Size Date; 464xlat_12_aarch64_generic.ipk: 4.9 KB: Tue Jul 7 08:25:35 2020: 6in4_25-1_all.ipk: 2.3 KB: Tue Jul 7 09:31:10 2020: 6rd_9-4_all.ipk openvpn package versions - Repology

OpenWrt Project: packages:index_lede17_1:network---vpn

GSoC 2017 Attended Sysupgrade - Freifunkblog May 30, 2017 luizluca: OpenWRT: Servidor VPN com OpenVPN openvpn-nossl (sem criptografia) openvpn-openssl; openvpn-polarssl; A primeira é mais enxuta mas não utiliza criptografia, o que normalmente é um requisito de um serviço VPN. Os dois seguintes são equivalentes, variando apenas a implementação de ssl que será utilizada. [How To] Tunnel MK5 through VPN - WiFi Pineapple Mark V