QGIS Compiling 3.6.0 Troubleshooting about PyQt5, SIP, Qscintilla on Ubuntu 18.04 LTS

Question

I work on UBUNTU 18.04 LTS/bionic, I am trying to compile QGIS 3.6.0, for an upgrade from QGIS 3.2. 0. I am facing the same trouble as several people the release compatibility between SIP and PyQT5 an more maybe.

For QGIS 3.2.0 compilation I worked with SIP 4.19.7 and PyQt5 5.11.3, I succeed the compilation.

For QGIS 3.6.0 I try PyQt5 5.12 and SIP 5.19.15 (GPL release). I download source tarball from RIVERBANK repository. I compile each of them, PyQt5 5.12 and SIP 5.19.15, with configure.py and PyThon 3.6.7. Everything seems OK installation are done. I remove any garbage (I think) about other SIP installation. I installed also QSCIintilla, release 2.11.1. The Qt release is 5.9.5

When, for QGIS 3.6.0, I prepare the Makefile with CMake, I have the following messages :

Traceback (most recent call last):
  File "/home/mbariou/WKSCOMPILE/QGIS/QGIS-final-3_6_0/cmake/FindPyQt5.py", line 34, in <module>
    import PyQt5.pyqtconfig
ModuleNotFoundError: No module named 'PyQt5.pyqtconfig'

In fact I have not a such module but I have:

/usr/local/py356/lib/python3.5/site-packages/pyqtconfig/config.py

More, also this error message from CMake :

Found SIP version: 4.19.15
Traceback (most recent call last):
File "/home/mbariou/WKSCOMPILE/QGIS/QGIS-final-3_6_0/cmake/FindQsci.py", line 45, in <module>
from PyQt5.Qsci import QSCINTILLA_VERSION_STR
RuntimeError: the sip module implements API v12.0 to v12.5 but the PyQt5.QtCore module requires API v12.6 

Qsci sip file not found - disabling bindings for derived classes

I met the same difficulty when I compiled QGIS 3.2.0 the conflict was the same with other release, bit I succeeded in a random way it seems, in fact I downgrade to the Ubuntu 18.04/bionic distribution about PyQt5 and SIP.

But the following message is recurrent :

RuntimeError: the sip module implements API v12.0 to v12.5 but the PyQt5.QtCore module requires API v12.6

Can somebody deciphers this conflict and what are the release rules to respect between :

• PyQt5,
• sip,
• Qt,
• QGIS ?

Answer 1

Success it Works

Finally I find a way to start correctly QGIS 3.6.1, with console Python. But I must say I don't decipher correctly the release relationship between SIP, PyQt5, Qt, and QGIS. My conclusion is sip 4.19.7 works for me.

How I proceed ?

1. First I remove any package (through apt-get (Unbuntu) or pip3 (Python) linked to sip, pyqt5, qscintilla

2. second with apt I have done the following install from the Ubuntu 18.04 LTS

   sudo apt install sip-dev python3-sip pyqt5-dev pyqt5.qsci-dev python-sip-dev python3-sip pyqt5-dev-tools python3-pyqt5 python3-pyqt5.qtmultimedia python3-pyqt5.qtopengl python3-pyqt5.qtquick python3-pyqt5.qtsql python3-pyqt5.qtsvg python3-pyqt5.qtwebkit python3-sip python3-sip-dev libqscintilla2-qt5-dev libqgis-customwidgets libqgis-gui3.4.5 libqscintilla2-qt5-13 openscad python-pyqt5.qsci python-qgis python-qgis-common python3-pyqt5.qsci

An then, I prepared the Makefile with CMake for QGIS 3.6.1, it was correct I runned the compile followed by install it succeeded !

On command line : > sip -V => 4.19.7

And when I run the following python script :

import sys
from sip import SIP_VERSION_STR
import sip
import qgis
print("SIP version:", SIP_VERSION_STR)

The result was :

SIP version: 4.19.13 PyQt version: 5.10.1 QScintilla version: 2.10.2

Two different numbers release for sip curious ?

When I start QGIS 3.6.1 , it failed about Python console and extension loading => I have the following messages "I translate from french language" : can'load extension 'geomovetools' call error to classFactory() ValueError: PyCapsule_GetPointer called with incorrect name

After some turn around on stackexchange I found the suggestion that I will have to recompile sip 4.19.7 from code source => https://github.com/eduardosm/sip-4.19.7

With the following configuration command :

python3 configure.py --sip-module PyQt5.sip --no-tools

And make and sudo make install for this sip built

I did that as indicated!

Now Everything is OK ! and QGIS 3.6.1 starts perfectly on Ubuntu 18.04 LTS

Now On my side I have :

sip -V => 4.19.7 (from /usr/bin/sip)

And when I run the following script :

import sys
from PyQt5.QtCore import QT_VERSION_STR
from PyQt5.Qt import PYQT_VERSION_STR
from sip import SIP_VERSION_STR
import sip
import qgis
from PyQt5.Qsci import QSCINTILLA_VERSION_STR
print(sip.__file__)
print("Qt version:", QT_VERSION_STR)
print("SIP version:", SIP_VERSION_STR)
print("PyQt version:", PYQT_VERSION_STR)
print("QScintilla version:", QSCINTILLA_VERSION_STR)

The result is :

usr/lib/python3/dist-packages/sip.cpython-36m-x86_64-linux-gnu.so
Qt version: 5.9.5
SIP version: 4.19.7
PyQt version: 5.10.1
QScintilla version: 2.10.2

I hope this can help others, for me it was like an escape from a jail where I was trapped for one month. Enjoy!