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pip unable to find an extension of a lib.


Using Python-3.7.2 (compiled with --with-pydebug) in a venv, I've 
encountered this problem:

$ pip install --upgrade pip setuptools wheel
Successfully installed setuptools-41.0.0 wheel-0.33.1

$ pip install pyqt5
 ? /pip/_vendor/html5lib/_trie/_base.py:3: DeprecationWarning: (skip)
 ? from collections import Mapping
Collecting pyqt5
 ? /pip/_vendor/msgpack/fallback.py:222: PendingDeprecationWarning: (skip)
 ? Using cached 
Collecting PyQt5_sip<4.20,>=4.19.14 (from pyqt5)
 ? Could not find a version that satisfies the requirement 
PyQt5_sip<4.20,>=4.19.14 (from pyqt5) (from versions: )
No matching distribution found for PyQt5_sip<4.20,>=4.19.14 (from pyqt5)

$ pip search pyqt5
 ? /pip/_vendor/html5lib/_trie/_base.py:3: DeprecationWarning: (skip)
 ? from collections import Mapping
pyqt5-tools ( - Tools to supplement the official 
PyQt5 wheels
PyQt5-stubs ( - PEP561 stub files for the PyQt5 
PyQt5-sip (4.19.15)?????????????? - Python extension module support for 
PyQt5 (5.12.1)??????????????????? - Python bindings for the Qt cross ...

The version of PyQt5-sip (4.19.15) seems OK, no ?

I've already posted on the PyQt ML, but I am the only one with this problem.

Thanks for all advices