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From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Tue, 27 Jun 2017 22:52:07 +0200
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Subject: Re: making wireguard work on RHEL7/etc.
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Okay, and for the kernel, please give this commit a try:

https://git.zx2c4.com/WireGuard/commit/?id=32e20ef627048ffa7f8cb3567e6b4c639cd42607

Or just run the latest git master.