urwid_readline-2.1.1 unsupported locale setting

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unpacking sources
unpacking source archive /nix/store/yff18arh680nd9jsx869zx1kgmn0y84r-urwid_readline-0.11.tar.gz
source root is urwid_readline-0.11
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copying urwid_readline/test_readline_edit.py -> build/lib/urwid_readline
copying urwid_readline/readline_edit.py -> build/lib/urwid_readline
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copying build/lib/urwid_readline/__init__.py -> build/bdist.linux-x86_64/wheel/urwid_readline
copying build/lib/urwid_readline/readline_edit.py -> build/bdist.linux-x86_64/wheel/urwid_readline
copying build/lib/urwid_readline/test_readline_edit.py -> build/bdist.linux-x86_64/wheel/urwid_readline
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Processing ./urwid_readline-0.11-py3-none-any.whl
Requirement already satisfied: urwid in /nix/store/j0zibzqxx8n79hg26dr3570ydz40k1d8-python3.8-urwid-2.1.1/lib/python3.8/site-packages (from urwid-readline==0.11) (2.1.1)
Installing collected packages: urwid-readline
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/build/urwid_readline-0.11
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post-installation fixup
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running test
WARNING: Testing via this command is deprecated and will be removed in a future version. Users looking for a generic test entry point independent of test runner are encouraged to use tox.
running egg_info
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running build_ext
urwid_readline (unittest.loader._FailedTest) ... ERROR

======================================================================
ERROR: urwid_readline (unittest.loader._FailedTest)
----------------------------------------------------------------------
ImportError: Failed to import test module: urwid_readline
Traceback (most recent call last):
  File "/nix/store/8hf2rpqx8fnx6a3jm9pvn0d40c065zxl-python3-3.8.3/lib/python3.8/unittest/loader.py", line 470, in _find_test_path
    package = self._get_module_from_name(name)
  File "/nix/store/8hf2rpqx8fnx6a3jm9pvn0d40c065zxl-python3-3.8.3/lib/python3.8/unittest/loader.py", line 377, in _get_module_from_name
    __import__(name)
  File "/build/urwid_readline-0.11/urwid_readline/__init__.py", line 1, in <module>
    from .readline_edit import ReadlineEdit
  File "/build/urwid_readline-0.11/urwid_readline/readline_edit.py", line 5, in <module>
    import urwid
  File "/nix/store/j0zibzqxx8n79hg26dr3570ydz40k1d8-python3.8-urwid-2.1.1/lib/python3.8/site-packages/urwid/__init__.py", line 26, in <module>
    from urwid.widget import (FLOW, BOX, FIXED, LEFT, RIGHT, CENTER, TOP, MIDDLE,
  File "/nix/store/j0zibzqxx8n79hg26dr3570ydz40k1d8-python3.8-urwid-2.1.1/lib/python3.8/site-packages/urwid/widget.py", line 27, in <module>
    from urwid.util import (MetaSuper, decompose_tagmarkup, calc_width,
  File "/nix/store/j0zibzqxx8n79hg26dr3570ydz40k1d8-python3.8-urwid-2.1.1/lib/python3.8/site-packages/urwid/util.py", line 61, in <module>
    detected_encoding = detect_encoding()
  File "/nix/store/j0zibzqxx8n79hg26dr3570ydz40k1d8-python3.8-urwid-2.1.1/lib/python3.8/site-packages/urwid/util.py", line 58, in detect_encoding
    locale.setlocale(locale.LC_ALL, initial)
  File "/nix/store/8hf2rpqx8fnx6a3jm9pvn0d40c065zxl-python3-3.8.3/lib/python3.8/locale.py", line 608, in setlocale
    return _setlocale(category, locale)
locale.Error: unsupported locale setting


----------------------------------------------------------------------
Ran 1 test in 0.000s

FAILED (errors=1)
Test failed: <unittest.runner.TextTestResult run=1 errors=1 failures=0>
error: Test failed: <unittest.runner.TextTestResult run=1 errors=1 failures=0>