usage: mmroff [-x] [groff-argument ...]
usage: mmroff --version
usage: mmroff --help

mmroff is a simple wrapper for groff(1), used to expand internal
references in mm documents; see groff_mm(7).  It also handles the
inclusion of PostScript images.  Documents that do not use these
features of groff mm (the INITI, IND, INDP, INITR, SETR, GETHN, GETPN,
GETR, GETST, PIC macros) do not require mmroff.  See the mmroff(1)
manual page.