Problem by installing RTEMS 5.1 on Windows 10

[Olga Syrbachova]

Hi! I have a problem installing RTEMS. I follow the tutorial step by step,
but something goes wrong. I work on Windows 10.

My steps after creating /c/opt/rtems

$ wget
https://ftp.rtems.org/pub/rtems/releases/5/5.1/sources/rtems-source-builder-5.1.tar.xz
$ tar Jxf rtems-source-builder-5.1.tar.xz
$ mv rtems-source-builder-5.1 5.1
...
$ source-builder/sb-check
RTEMS Source Builder - Check, 5.not_released
Environment is ok

What does 5.not_released mean?

By running
$ ../source-builder/sb-set-builder --list-bsets
I get
$ ../source-builder/sb-set-builder --list-bsets
RTEMS Source Builder - Set Builder, 5.1
Traceback (most recent call last):
  File "../source-builder/sb/cmd-set-builder.py", line 26, in <module>
    setbuilder.run()
  File "../source-builder/sb/setbuilder.py", line 722, in run
    if not list_bset_cfg_files(opts, configs):
  File "../source-builder/sb/setbuilder.py", line 670, in
list_bset_cfg_files
    print('Examining: %s' % (os.path.relpath(p)))
LookupError: unknown encoding: cp65001

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