musicxml2ly 2.20 bug

[Павел Буданов]

I tried to use musicxml2ly from official repository of manjaro linux and
get this output:
Traceback (most recent call last):
  File "/usr/bin/musicxml2ly", line 44, in <module>
    import lilylib as ly
ImportError: No module named lilylib
Then I tried to install lilypond from official cite via shell script. It
gives following output:
  File "./lilypond/usr/bin/musicxml2ly", line 2264
    if current_staff and staff <> current_staff and not
n.get_maybe_exist_named_child('chord'):
                                ^
SyntaxError: invalid syntax