I'd like to write a document in plan9port's troff (I'll need esperanto 
glyphs), and I even cannot success getting a postscript from a manpage.

I run, as stated in tr2post(1):
troff -man /usr/plan9/man/man1/tr2post.1 | tr2post | psfonts

and I get:
%!PS-Adobe-2.0
tr2post: <stdin>:6 :WARNING: cannot open file #9/troff/font/devps/TR
tr2post: <stdin>:6 :WARNING: fontpos=5
tr2post: <stdin>:6 :WARNING: fontmtab[0]=0x0
tr2post: <stdin>:6 :WARNING: fontmtab[1]=R
tr2post: <stdin>:6 :WARNING: fontmtab[2]=I
tr2post: <stdin>:6 :WARNING: fontmtab[3]=B
tr2post: <stdin>:6 :WARNING: fontmtab[4]=BI
tr2post: <stdin>:6 :WARNING: fontmtab[5]=TR
tr2post: <stdin>:6 :WARNING: fontmtab[6]=H
tr2post: <stdin>:6 :WARNING: fontmtab[7]=HI
tr2post: <stdin>:6 :WARNING: fontmtab[8]=HB
tr2post: <stdin>:6 :WARNING: fontmtab[9]=S1
tr2post: <stdin>:6 :WARNING: fontmtab[10]=S

being the tr2post: lines in stderr. Any clue about the problem? It's the 
first time I'm trying to use plan9's troff, so I'm quite lost.

Thanks in advance,
Lluís