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From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Wed, 14 Dec 2016 22:07:24 +0100
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Subject: Re: [WireGuard] Wireguard in OpenWRT/LEDE: FYI: Pull Request
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 Baptiste Jonglez <baptiste@bitsofnetworks.org>
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On Wed, Dec 14, 2016 at 8:48 PM, Dan L=C3=BCdtke <mail@danrl.com> wrote:
>
>> Not sure why the dependency is
>> hard coded like this; it shouldn't be.
>
> Even if it wasn't hardcoded, it would be introduced by +kmod-udptunnel6 a=
nyway.
>
> Remove both manually if you really need to throw away IP and want to comp=
ile legacyIP only. It should work with both, @IP6 and kmod-udptunnel6 remov=
ed.

kmod-udptunnel6 is only required if IPv6 is turned on.

At least in menuconfig, it's easy to describe conditional dependencies
like this one. Can the OpenWRT makefile thinger do it too? Baptiste?