The pppox module is a dependency of pppoe/pptp/pppol2tp and does not have a separate Kconfig symbol. Signed-off-by: Qingfang Deng <dqfext@gmail.com> Link: https://github.com/openwrt/openwrt/pull/23077 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>