For most Linux distributions, emacs is able to display Belarusian characters out of box. However, the following conditions should satisfy:
The user may want to change the default keyboard layout ("input method" in emacs slang) to jcuken. This feature is provided by belarusian.el along with some other goodies. Read the comments in the beginning of belarusian.el for details.
buildhash belarusian.sml belarusian.aff belarusian.hash
ispell -d belarusian yourfile.txt
Getting belarusian ispell dictionary working with emacs is a bit tricky.
from Aleksey Novodvorsky:
You need TeX + babel + T2, e.g. teTeX >= 1.0. in order to get partial support for Belarusian,
\documentclass[belarusian]{article} \usepackage[cp1251]{inputenc}
\usepackage{babel}
or
\documentclass[belarusian]{article} \usepackage[iso88595]{inputenc}
\usepackage{babel}