of the filename is a symbolic link. Note: in some cases the file may still
be opened which can in itself be a problem. This solves the security
hole where the bad-guy creates a symbolic link named /tmp/screen-exchange
pointing to a file that s/he wishes root to clobber.
Install screenrc in /etc (but do not overright existing file).
Install latest screenrc and screencap in /usr/local/lib/screen for
reference (and so pkg_add knows where to get them from).
