Hi folks, there seems to be a typo in the texinfo file for the current version of groff. In my opinion "-Tdef" should rather read "-Tdev".
--- groff-1.22.2/doc/groff.texinfo 2013-02-07 13:06:11.000000000 +0100 +++ groff-1.22.2/doc/groff.texinfo-fixed 2014-01-01 18:11:44.000000000 +0100 @@ -971,7 +971,7 @@ groff [ -abceghijklpstvzCEGNRSUVXZ ] [ -d@var{cs} ] [ -D@var{arg} ] [ -f@var{fam} ] [ -F@var{dir} ] [ -I@var{dir} ] [ -K@var{arg} ] [ -L@var{arg} ] [ -m@var{name} ] [ -M@var{dir} ] [ -n@var{num} ] - [ -o@var{list} ] [ -P@var{arg} ] [ -r@var{cn} ] [ -T@var{def} ] + [ -o@var{list} ] [ -P@var{arg} ] [ -r@var{cn} ] [ -T@var{dev} ] [ -w@var{name} ] [ -W@var{name} ] [ @var{files}@dots{} ] @endExample Best regards Ralph