[xmonad] does this xmonad support utf8?

im using arch linux and this is the official build file:

runhaskell Setup.lhs configure --ghc --prefix=/usr \ --libsubdir=\$compiler/site-local/\$pkgid || return 1

runhaskell Setup.lhs build || return 1

is utf8 supported by default? if not, how to add utf8 support? i want to display window title with chinese characters in xmobar, but it always does not work. thanks lars