From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: Jason@zx2c4.com
Received: from krantz.zx2c4.com (localhost [127.0.0.1])
 by krantz.zx2c4.com (ZX2C4 Mail Server) with ESMTP id 78a8be04
 for <wireguard@lists.zx2c4.com>;
 Mon, 26 Jun 2017 10:31:18 +0000 (UTC)
Received: from frisell.zx2c4.com (frisell.zx2c4.com [192.95.5.64])
 by krantz.zx2c4.com (ZX2C4 Mail Server) with ESMTP id 8a409e6f
 for <wireguard@lists.zx2c4.com>;
 Mon, 26 Jun 2017 10:31:18 +0000 (UTC)
Received: by frisell.zx2c4.com (ZX2C4 Mail Server) with ESMTP id b82385c7
 for <wireguard@lists.zx2c4.com>;
 Mon, 26 Jun 2017 10:44:52 +0000 (UTC)
Received: by frisell.zx2c4.com (ZX2C4 Mail Server) with ESMTPSA id e67002ba
 (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128:NO)
 for <wireguard@lists.zx2c4.com>;
 Mon, 26 Jun 2017 10:44:51 +0000 (UTC)
Received: by mail-oi0-f47.google.com with SMTP id c189so52222617oia.2
 for <wireguard@lists.zx2c4.com>; Mon, 26 Jun 2017 03:47:40 -0700 (PDT)
MIME-Version: 1.0
In-Reply-To: <CAHmME9oHG6a1==KzrrfuvmkKoVJHhTtToP00qYtcKXEGDCnm8Q@mail.gmail.com>
References: <alpine.LRH.2.20.1706241613350.14074@bcny.fcbq.bet>
 <87o9tbuq7a.fsf@correspondwith.me>
 <alpine.LRH.2.20.1706260917250.14074@bcny.fcbq.bet>
 <CAHmME9p++Q0v6Ypt2Y5AFZO36hHnTKv7KBnWNnSk84V8YK+oJw@mail.gmail.com>
 <alpine.LRH.2.20.1706261023540.14074@bcny.fcbq.bet>
 <CAHmME9oHG6a1==KzrrfuvmkKoVJHhTtToP00qYtcKXEGDCnm8Q@mail.gmail.com>
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Mon, 26 Jun 2017 12:47:39 +0200
Message-ID: <CAHmME9ph1LQ0kufpf2RMDsMRpz7txWJGvr=d=Jr5Z1kxqqOWfQ@mail.gmail.com>
Subject: Re: making wireguard work on RHEL7/etc.
To: wireguard@wut.to
Content-Type: text/plain; charset="UTF-8"
Cc: WireGuard mailing list <wireguard@lists.zx2c4.com>
List-Id: Development discussion of WireGuard <wireguard.lists.zx2c4.com>
List-Unsubscribe: <https://lists.zx2c4.com/mailman/options/wireguard>,
 <mailto:wireguard-request@lists.zx2c4.com?subject=unsubscribe>
List-Archive: <http://lists.zx2c4.com/pipermail/wireguard/>
List-Post: <mailto:wireguard@lists.zx2c4.com>
List-Help: <mailto:wireguard-request@lists.zx2c4.com?subject=help>
List-Subscribe: <https://lists.zx2c4.com/mailman/listinfo/wireguard>,
 <mailto:wireguard-request@lists.zx2c4.com?subject=subscribe>

Actually, you're right. This seems best:

#if defined(RHEL_MAJOR) && RHEL_MAJOR <= 7

Looking forward to your patches!