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Question:

    LaTeX complains about missing commands I have not used. Why?

Answer:

    The ucs package uses many macros from many packages. You have to
    include these into your preamble. To find out which package contains
    the missing macro, you can use e.g.
    
        perl discovermacro.pl \themissingmacro

    or

        perl discovermacro.pl mydocument.log

    or have a look at the human readable file ltxmacrs.txt.



Question:

    The package complains about the missing file uni-global.def (and
    other files), but they are in the TeX search path.

Answer:

    Perhaps you have put the ucs/data directory in a directory where TeX
    does not search recursively (e.g. your private TeX directory or the
    current directory). You can change this by putting the ucs package
    into a recursively searched directory or by putting the files in
    ucs/data directly into the searched directory at top level.



Question:

    When I try to activate options in \usepackage[...]{ucs}, LaTeX
    complains about an option clash.

Answer:

    ucs.sty probably already got loaded via
    \usepackage[utf8x]{inputenc}. Try loading ucs.sty first or set the
    options with \SetUnicodeOption.



Question:

    Is the ucs package the same as the unicode package?

Answer:

    Dominique Unruh, the original author of the ucs package, started
    with unicode.sty, but there was a name clash with Sebastian Rahtz'
    jadetex/passivetex package. So he later used the name ucs.sty
    instead of unicode.sty. The package was subsequently called "ucs" in
    TeXLive and installed into the directory tex/latex/ucs. However, it
    was still called "unicode" in MiKTeX and on CTAN. In April 2012, it
    was decided that the name "unicode" should not be used anymore to
    avoid confusion. So it is now the ucs package.



Question:

    I get an "TeX capacity exceeded" error. What can I do?

Answer:

    Try the option "savemem". This will reduce the memory consumption of
    ucs.sty, especially if you use CJK glyphs, but will also slow down
    operation significantly. Or increase TeX's capacity, if this is
    feasible in your situation.



Question (Esperanto):

    LATIN SMALL LETTER H WITH CIRCUMFLEX is ugly. ^h with babel package
    option esperanto is not. Why?

Answer:

    esperanto.ldf has its own macro for ^h, ucs uses the standard \^h.
    Add \DeclareTextCompositeCommand{\^}{T1}{h}{h\llap{\^{}}}
    \DeclareTextCompositeCommand{\^}{OT1}{h}{h\llap{\^{}}} to your
    preamble, then \^h and the corresponding unicode character will
    yield the same as ^h.



Question:

    When a line of my document displayed in the TeX terminal output or
    logfile, the non ascii characters are replaced by garbage. Why?

Answer:

    The first possibility is, that you don't read the output with a
    unicode enabled terminal. The second is, that TeX replaces some
    bytes by ^^XX sequences. I do not know how to tell TeX which
    characters are to be escaped that way (tell me if you do). If no
    other mean helps, you can use latexout.pl which converts such output
    to UTF-8.