musicxml2ly, midi2ly etc. broken ?

[flup2]

Hello,

Since a few versions (in the development branch, now 2.13.21), I get that
kind of message while running converters included in Lilypond. This is the
message shown when running midi2ly from the Terminal under Mac OS X

-------------------------
Could not find platform independent libraries <prefix>
Could not find platform dependent libraries <exec_prefix>
Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
'import site' failed; use -v for traceback
Traceback (most recent call last):
  File "/Applications/LilyPond.app/Contents/Resources/bin/midi2ly", line 37,
in <module>
    import os
ImportError: No module named os
Hello,

Since a few versions (in the development branch, now 2.13.21), I get that
kind of message while running converters included in Lilypond. This is the
message shown when running midi2ly from the Terminal under Mac OS X

-------------------------
Any idea about fixing that (aside running an older verison) ?

Do other people have the same problem ?
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