hyphenating non-english characters

[Gáspár Gergő]

Hi,

I'm trying to make justified text look nicer, so I turned to hyphenation. 
Hungarian is not supported out of the box by groff, but I found a tex patterns
file which seems quite good, that is what I tried to use, to not much success.
Hyphenation happens, but not as often as I'd hope. After some more reading, 
I think the problem might be with the accented Hungarian characters not having 
hyphenation codes assigned to them, since hyphenation seemingly only happens 
near non-accented vowels.

These are the requests that I used for hyphenation originally:
.hla hu
.hpf /home/gergo/projekt/jella/huhyphn.tex
.hy 1

The manual told me that
> A hyphenation code must be an ordinary character (not a special character 
> escape sequence) other than a digit or a space.
So I tried following the example, with these requests:
.hcode á á Á á
.hcode é é É é
.hcode í í Í í
.hcode ó ó Ó ó
.hcode ö ö Ö ö
.hcode ő ő Ő ő
.hcode ú ú Ú ú
.hcode ü ü Ü ü
.hcode ű ű Ű ű

However, groff throws errors saying "error: hyphenation code must be ordinary 
character". I tried with and without preconv to no avail. The example supplied
in the manual, with German characters, didn't work either.

What could be the problem here?

Best regards,
Gergő Gáspár