Hi Tadziu, > > $ groff -Ww <<<.ny0 ... > There's a typo in the command line: -ww enables warnings, -Ww disables > them.
Hah! Thanks. I even checked it in the documentation. That's muscle-memory for you; gcc's -W. $ groff -ww <<<.ny0 <standard input>:1: warning: macro `ny0' not defined $ -- Cheers, Ralph.