From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Monjalon <thomas@monjalon.net>
Subject: Re: [PATCH] crypto/aesni_mb: fix compile
Date: Thu, 17 Jan 2019 23:26:41 +0100
Message-ID: <1988021.QFEkKv4KUp@xps>
References: <20190116132114.65674-1-roy.fan.zhang@intel.com>
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Cc: dev@dpdk.org, akhil.goyal@nxp.com, pablo.de.lara.guarch@intel.com
To: Fan Zhang <roy.fan.zhang@intel.com>
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16/01/2019 14:21, Fan Zhang:
> This patch fixes the inflexible compile issue AESNI-MB PMD.
> Originally the compile of the PMD will fail if IPSec_MB is
> not installed in default location.
> 
> Fixes: c68d7aa354f6 ("crypto/aesni_mb: use architecture independent macros")
> 
> Signed-off-by: Fan Zhang <roy.fan.zhang@intel.com>
> ---
> -IMB_HDR = /usr/include/intel-ipsec-mb.h
> +IMB_HDR = $(shell echo "\#include <intel-ipsec-mb.h>" | \

What is the backslash? Looks like a typo.

> +	$(CC) -E $(EXTRA_CFLAGS) - | grep 'intel-ipsec-mb.h' | \
> +	head -1 | cut -d'"' -f2)

I think the most standard invocation of head is "head -n1".
You can also use "sed 1q".