From owner-freebsd-ports@freebsd.org  Mon Mar 13 01:17:24 2017
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To: freebsd-ports@freebsd.org
References: <20170312225928.GB82636@doctor.nl2k.ab.ca>
Subject: Re: Firefox port issue
From: Walter Schwarzenfeld <w.schwarzenfeld@utanet.at>
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Date: Mon, 13 Mar 2017 02:17:17 +0100
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I don't believe this causss the error, but your syntax is deprecated, use:

DEFAULT_VERSIONS+=linux=c7_64 ruby=ruby?.2 python=2.7 ssl=openss bdb=6l

in one line.

If you have other versions of python installed you need e.g.
python=2.7 python2=2.7 python3=3.5 in DEFAULT_VERSIONS.