-static int show_manpage(const char *pager, char *man_filename, int man, int level);
+On another system I see this:
+
+... | tbl | nroff -mandoc -rLL=<NNN>n -rLT=<NNN>n -Tutf8 | less
+
+where <NNN> is screen width minus 5.
+Replacing "DEFINE nroff nroff -mandoc" in /etc/man_db.conf
+changes "nroff -mandoc" part; -rLL=<NNN>n, -rLT=<NNN>n and -Tutf8 parts are
+appended to the user-specified command.
+
+Redirecting to a pipe or file sets GROFF_NO_SGR=1 to prevent color escapes,
+and uses "col -b -p -x" instead of pager, this filters out backspace
+and underscore tricks.
+*/