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Some newer GNU/Linux systems no longer have a "utmp" file. This file is used by both syslogd and talkd to find the TTY device files of active user sessions in order to send messages to specific or all users. Gnulib can emulate a utmp file via the read_utmp() function from the readutmp module. This emulation is activated by defining "READUTMP_USE_SYSTEMD", triggered via configure's "--enable-systemd" option on systems without utmp and with systemd. But, this emulation reports non-existing TTY device files for active user sessions. Attempting to send a message to a non-existing TTY produces an error, but that is normal behavior for such a system. Thus, ignore this error on such systems, but not others. * NEWS.md: Mention enhancement. * libinetutils/ttymsg.c (inetutils_ttymsg): Ignore errors for non-existings TTY files reported in emulated utmp entries.