From owner-freebsd-ports@freebsd.org  Sun Mar 12 14:13:36 2017
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To: freebsd-ports@freebsd.org
References: <20170312124525.GC63343@doctor.nl2k.ab.ca>
Subject: Re: Flashplayer issue
From: Walter Schwarzenfeld <w.schwarzenfeld@utanet.at>
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Date: Sun, 12 Mar 2017 15:13:31 +0100
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Try
pkg delete `pkg which 
/usr/local/lib/browser_plugins/linux-flashplayer/libflashplayer.so`

and try
make install clean again.