I occasionnally use setxkbmap 'us(intl)' in order to have diacritics as dead keys.
I have LC_CTYPE=en_US.UTF-8 If I type 'c I get a ç in programs like firefox or chrome, BUT I get ć in xterm ? why are things different ? which program is right ? (I have just tried with a test user with nothing configured besides LC_CTYPE=en_US.UTF-8, without which xterm/vim doesn't show proper characters)