I'm on Trixie (next stable in a couple of weeks), and only build QWT myself from source:
# https://qwt.sourceforge.io/qwtinstall.html # download the tar.bz2 from https://sourceforge.net/projects/qwt/files/qwt/6.3.0/ # unpack and go into ~/git/qwt-6.3.0 dir # error: qmake: could not find a Qt installation of '' -> https://askubuntu.com/questions/1460242/ubuntu-22-04-with-qt6-qmake-could-not-find-a-qt-installation-of? qtchooser -install qt6 $(which qmake6) export QT_SELECT=qt6 # create Makefile /usr/bin/qmake qwt.pro # compile make # install (in /usr/local/qwt-6.3.0 ) sudo make install Then, leaving out a lot of stuff...: mkdir buildqt6;cd buildqt6;ccmake -GNinja -DBUILD_TESTING=FALSE -DENABLE_TESTS=OFF -DWITH_SERVER=FALSE -DWITH_3D=FALSE -DCMAKE_INSTALL_PREFIX=/home/richard/bin/qgis_/qt6/debug -DWITH_QWTPOLAR=OFF -DCMAKE_BUILD_TYPE=Debug -DWITH_GRASS=FALSE -DBUILD_WITH_QT6=TRUE -DWITH_OAUTH2_PLUGIN=FALSE -DWITH_WITH_SERVER_PLUGINS=OFF -DWITH_STAGED_PLUGINS=OFF -DWITH_PDAL=OFF -DWITH_QTWEBKIT=OFF -DQWT_INCLUDE_DIR=/usr/local/qwt-6.3.0/include -DQWT_LIBRARY=/usr/local/qwt-6.3.0/lib/libqwt.so .. in the same git repo as my qt5 build, QGIS works. I'm on python 3.13.5 here Not sure if this helps... Richard On 21-07-2025 17:52, Alessandro Pasotti via QGIS-Developer wrote:
Thanks, I'm using Python 3.13 (that comes with that Ubuntu version). Now I'm trying with vcpkg ... On Mon, Jul 21, 2025 at 5:35 PM pathmapper <[email protected] <mailto:[email protected]>> wrote: Hi, I don't know what's wrong, but when I had similar problems, switching to Python 3.12 solved them for me. Cheers, Björn On 21.07.2025 16:58, Alessandro Pasotti via QGIS-Developer wrote: > Hi, > > I am trying to build QGIS with QT6 on Ubuntu (tried 24.10 and 25.04), > it builds without errors but when I run it, the following error > appears: > > Couldn't load PyQGIS. > Python support will be disabled. > > Traceback (most recent call last): > File "", line 1, in > File > "/home/ale/dev/QGIS/build/Desktop_QT6-Debug/output/python/qgis/gui/__init__.py", > line 25, in > from qgis._gui import * > RuntimeError: qgis._gui cannot import type '���A� ' from > PyQt6.QtCore > > Python version: > 3.13.3 (main, Jun 16 2025, 18:15:32) [GCC 14.2.0] > > QGIS version: > 3.99.0-Master 'Master', e717e3cd2b9 > > Python path: > ['/home/ale/dev/QGIS/build/Desktop_QT6-Debug/output/python', > '/home/ale/.local/share/QGIS/QGIS3/profiles/default/python', > '/home/ale/.local/share/QGIS/QGIS3/profiles/default/python/plugins', > '/home/ale/dev/QGIS/build/Desktop_QT6-Debug/output/python/plugins', > '/home/ale/dev/gdal/desktop-install/local/lib/python3.13/dist-packages', > '/home/ale/dev/gdal/autotest/pymod', '/usr/lib/python313.zip', > '/usr/lib/python3.13', '/usr/lib/python3.13/lib-dynload', > '/usr/local/lib/python3.13/dist-packages', > '/usr/lib/python3/dist-packages'] > > I checked the QGIS/build/Desktop_QT6-Debug/output/python/qgis content > and it looks legit. > > PyQt6 installation also looks ok, importing core works ok, only gui > does not work. > > Any idea about what's going wrong? > > -- > > Alessandro Pasotti > QCooperative: www.qcooperative.net <http://www.qcooperative.net> [1] > ItOpen: www.itopen.it <http://www.itopen.it> [2] > > Links: > ------ > [1] https://www.qcooperative.net <https://www.qcooperative.net> > [2] http://www.itopen.it <http://www.itopen.it> > > _______________________________________________ > QGIS-Developer mailing list > [email protected] <mailto:[email protected]> > List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer <https://lists.osgeo.org/mailman/listinfo/qgis-developer> > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer <https://lists.osgeo.org/mailman/listinfo/qgis-developer> -- Alessandro Pasotti QCooperative: www.qcooperative.net <https://www.qcooperative.net> ItOpen: www.itopen.it <http://www.itopen.it> _______________________________________________ QGIS-Developer mailing list [email protected] List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
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