[Qgis-developer] Wiki page/area for 'Building QGIS from scratch'

[gordon at shieldaig.com]

On my Ubuntu 17.04 system in `/usr/lib/x86_64-linux-gnu/`:

`libQt5Core.so.5.7.1` exists
`libQt5Core.so.5.7` is a symbolic link
`libQt5Core.so.5` is a symbolic link
`libQt5Core.so` is a symbolic link

what do you recommend?



On 2017-03-22 04:44, Mark Johnson wrote:
>>> On Ubuntu 17.04, which is based on Qt5.7.1, output from
>> 
>>> `./output/bin/qgis`
>> 
>>> 
>> 
>>> `Couldn't load PyQt.
>> 
>>> Python support will be disabled. (a really big deal)
>> 
>>> 
>> 
>>> Traceback (most recent call last):
>> 
>>> File "", line 1, in
>> 
>>> ImportError: /usr/lib/x86_64-linux-gnu/libQt5Core.so.5: version
>>> `Qt_5.8'
>> 
>>> not found (required by
>> 
>>> /usr/local/lib/python3.5/dist-packages/PyQt5/QtCore.so)`
> 
> I have added a new page called 'Starting QGIS3 as seen from
> lddtree.sh'
> 
> https://github.com/qgis/QGIS-Documentation/wiki/QGIS3-lddtree-sh
> 
> As is often the case, complex Applications often fail for many
> different reasons.
> This page show what steps where undertaken to resolve these problems.
> 
> lddtree.sh is a forked version of the original lddtree that, for me,
> brings better result. (source and download link are supplied on that
> page).
> 
> Here, in this case, it is important to check if both QGIS3 and
> PyQt5/QtCore.so use the same libQt5Core.so.5
> - I believe it is save to assume that both MUST use the same QT5
> Version, since QtCore.so is a (I believe) a function interface between
> python3 and libQt5Core
> 
> The page shows the result of both QGIS3 and PyQt5/QtCore.so (both of
> which work correctly) as an comparison.
> 
> In this case, I think, the cause of the problem is more likly to be
> that:
> -> /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
> --> does not exsit on your system
> 
> Mark
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