[bug-gtypist] Invalid or incomplete multibyte or wide character

[gevisz]

I have just installed gtypist v.2.9.5 on my Gentoo box and tried
$ gtypist ru.typ
gtypist: line 34: iconv() failed on 'B: Добро пожаловать!':
Invalid or incomplete multibyte or wide character
You should probably use a UTF-8 locale for the selected lesson!
:
?

What can I do about it?

My
$ locale
LANG=en_US.UTF-8
LC_CTYPE=en_US.UTF-8
LC_NUMERIC=en_US.UTF-8
LC_TIME=en_US.UTF-8
LC_COLLATE=C
LC_MONETARY=en_US.UTF-8
LC_MESSAGES=en_US.UTF-8
LC_PAPER=en_US.UTF-8
LC_NAME=en_US.UTF-8
LC_ADDRESS=en_US.UTF-8
LC_TELEPHONE=en_US.UTF-8
LC_MEASUREMENT=en_US.UTF-8
LC_IDENTIFICATION=en_US.UTF-8
LC_ALL=