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From: Thomas Monjalon <thomas.monjalon@6wind.com>
To: Panu Matilainen <pmatilai@redhat.com>
Date: Thu, 12 Feb 2015 15:05:11 +0100
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Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH] Make -Werror optional
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2015-02-12 15:58, Panu Matilainen:
> +  # see if we're building from git
> +  ifneq ($(wildcard $(RTE_SDK)/.git),)
> +    DEVEL_BUILD := y
> +  endif

Yes it allows to force DEVEL_BUILD to any value on command line.
But please use RTE_ prefix.