groff options /tmp/ll does not work any more?

[Shaul Karl]

        Hello,
I do not know if this is only on my unstable Debian machine but
        groff -te -Tlatin1 -mandoc /tmp/ll -
no longer work. I am getting an empty string instead.
Am I missing something? Is there a work around?

[09:55:09 /tmp]$ zcat /usr/share/man/man1/ls.1.gz | groff -te -Tlatin1 -mandoc 
/tmp/ll -
[09:55:16 /tmp]$ echo $?
0
[09:55:21 /tmp]$