pip install romkan failed in windows 10 with python 3.9.6 with the following error message:

README = open(os.path.join(here, 'README.rst')).read()
       File "C:\Python396\lib\encodings\cp1250.py", line 23, in decode
         return codecs.charmap_decode(input,self.errors,decoding_table)[0]
     UnicodeDecodeError: 'charmap' codec can't decode byte 0x83 in position 182

I could overcome this issue by setting PYTHONUTF8=1 environment variable.
(In the code, encoding="utf-8" should be added to open().)

Also, there was a deprecation notice:
DeprecationWarning: the imp module is deprecated in favour of importlib