[PyQt] Can't install eric 19 in debian 9.6

[Starglider Developer]

I get this error:
Shall 'QScintilla' be installed using pip? (Y/n) Y
Requirement already satisfied: QScintilla in
/usr/local/lib/python3.5/dist-packages
Requirement already satisfied: PyQt5>=5.10.1 in
/usr/local/lib/python3.5/dist-packages (from QScintilla)
Requirement already satisfied: sip<4.20,>=4.19.4 in
/usr/local/lib/python3.5/dist-packages (from PyQt5>=5.10.1->QScintilla)
Sorry, please install QScintilla2 and
its PyQt5/PyQt4 wrapper.
Error: /usr/local/lib/python3.5/dist-packages/PyQt5/Qt/lib/libQt5Core.so.5:
version `Qt_5.11' not found (required by
/usr/local/lib/python3.5/dist-packages/PyQt5/Qsci.so)
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