The path to locale.alias is hardcoded into luit's source, namely in parser.h:
#ifndef LOCALE_ALIAS_FILE
#define LOCALE_ALIAS_FILE "/usr/X11R6/lib/X11/locale/locale.alias"
#endif

LOCALE_ALIAS_FILE is not defined anywhere else neither in luit's source nor
in any other X library's source. As a result, luit tries to open
/usr/X11R6/lib/X11/locale/locale.alias, but it fails since libx11 has
installed this file to a different location (and anyway it'll be X11R7 soon).

As a result, luit starts up with a warning like this:
Warning: couldn't find charset data for locale hu_HU; using ISO 8859-1.
and then operates incorrectly since assumes an incorrect charset.

Suggested fixes:

either: preprocess parser.h, just as luit.man is preprocessed now, so the
manpage of luit mentions the real location of my locale.alias file;

or: define LOCALE_ALIAS_FILE in a header file shipped by libx11 (which ships
this locale.alias file too) and make sure to include this from luit.