From owner-freebsd-ports@freebsd.org  Sun Nov 12 19:20:42 2017
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References: <20171112191659.GA2179@c720-r314251>
Subject: Re: Firefox doesn't build...
From: Walter Schwarzenfeld <w.schwarzenfeld@utanet.at>
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Date: Sun, 12 Nov 2017 20:20:36 +0100
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Yes, it is unset by default.
I changed it to reduce compile time.
(Maybe, some other do it for the same
reason).