netdev - samples don't build on v4.18

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Message-ID: <20180815012054.GA70201@joelaf.mtv.corp.google.com>
Date:   Tue, 14 Aug 2018 18:20:54 -0700
From:   Joel Fernandes <joelaf@...gle.com>
To:     linux-kernel@...r.kernel.org, wangnan0@...wei.com,
        netdev@...r.kernel.org, ast@...nel.org, acme@...nel.org,
        fengc@...gle.com
Subject: samples don't build on v4.18


Hi,
When building BPF samples on v4.18, I get the following errors:

$ cd samples/bpf/
$ make

Auto-detecting system features:
...                        libelf: [ OFF ]
...                           bpf: [ OFF ]

No libelf found
Makefile:213: recipe for target 'elfdep' failed
-----------

I bissected it down to commit 5f9380572b4bb24f60cd492b1

Author: Jakub Kicinski <jakub.kicinski@...ronome.com>
Date:   Thu May 10 10:24:39 2018 -0700

    samples: bpf: compile and link against full libbpf
---------

Checking out a kernel before this commit makes the samples build. Also I do
have libelf on my system.

Any thoughts on this issue?

thank you,

- Joel