From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Monjalon <thomas.monjalon@6wind.com>
Subject: Re: [PATCH] mk: fix FreeBSD build
Date: Mon, 18 Jul 2016 15:25:54 +0200
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References: <1468847463-107132-1-git-send-email-sergio.gonzalez.monroy@intel.com>
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To: Sergio Gonzalez Monroy <sergio.gonzalez.monroy@intel.com>,
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2016-07-18 14:11, Sergio Gonzalez Monroy:
> The sed syntax of '0,/regexp/' is GNU specific and fails with
> non GNU sed in FreeBSD.
> 
> To solve the issue we can use awk instead to remove duplicates.

Christian, an opinion please?

> Fixes: b2063f104db7 ("mk: filter duplicate configuration entries")
> 
> Signed-off-by: Sergio Gonzalez Monroy <sergio.gonzalez.monroy@intel.com>
[...]
> -		for config in $$(grep -v "^#" $(RTE_OUTPUT)/.config_tmp | cut -d"=" -f1 | sort | uniq -d); do \
> -			while [ $$(grep "^$${config}=" $(RTE_OUTPUT)/.config_tmp -c ) -gt 1 ]; do \
> -				sed -i "0,/^$${config}=/{//d}" $(RTE_OUTPUT)/.config_tmp; \
> -			done; \
> -		done; \
> +		grep -v "^#" $(RTE_OUTPUT)/.config_tmp | awk -F'=' '{a[$$1]=$$0} END {for (i in a) print a[i]}' > $(RTE_OUTPUT)/.config_tmp2 ; \
> +		mv $(RTE_OUTPUT)/.config_tmp2 $(RTE_OUTPUT)/.config_tmp ; \
> +		rm -f $(RTE_OUTPUT)/.config_tmp2 ; \

You can avoid creating/deleting the file .config_tmp2 by using a variable:
	config=$(grep -v '^#' $(RTE_OUTPUT)/.config_tmp)
	echo "$config" | awk ... > $(RTE_OUTPUT)/.config_tmp