From owner-freebsd-ports@freebsd.org  Sat Aug 26 08:56:08 2017
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From: Walter Schwarzenfeld <w.schwarzenfeld@utanet.at>
Subject: screen, ncurses and ncurses.mk
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Date: Sat, 26 Aug 2017 10:55:59 +0200
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The maintainer of sysutils/screen changed to USES=ncurses:base.

This will not work if ncurses:ports is installed (python uses it).

Ncurses.mk has:

if exists(${LOCALBASE}/lib/libncurses.so)

followed by a warning and exit.

So no port can install ncurses:base if ncurses:ports is installed.