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Bug 1898932 - qgis fails to build with Python 3.10: CMake cannot find Python
Summary: qgis fails to build with Python 3.10: CMake cannot find Python
Alias: None
Product: Fedora
Classification: Fedora
Component: qgis
Version: rawhide
Hardware: Unspecified
OS: Unspecified
Target Milestone: ---
Assignee: Volker Fröhlich
QA Contact: Fedora Extras Quality Assurance
Depends On:
Blocks: PYTHON3.10
TreeView+ depends on / blocked
Reported: 2020-11-18 10:52 UTC by Miro Hrončok
Modified: 2021-06-14 10:35 UTC (History)
7 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Last Closed: 2021-06-14 10:35:37 UTC
Type: Bug

Attachments (Terms of Use)

Description Miro Hrončok 2020-11-18 10:52:47 UTC
qgis fails to build with Python 3.10.0a2.

CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
    linked by target "qgispython" in directory /builddir/build/BUILD/qgis-3.16.0/src/python
    linked by target "python_module_qgis__server" in directory /builddir/build/BUILD/qgis-3.16.0/python
    linked by target "python_module_qgis__gui" in directory /builddir/build/BUILD/qgis-3.16.0/python
    linked by target "python_module_qgis__core" in directory /builddir/build/BUILD/qgis-3.16.0/python
    linked by target "python_module_qgis__3d" in directory /builddir/build/BUILD/qgis-3.16.0/python
    linked by target "python_module_qgis__analysis" in directory /builddir/build/BUILD/qgis-3.16.0/python

For the build logs, see:

For all our attempts to build qgis with Python 3.10, see:

Testing and mass rebuild of packages is happening in copr. You can follow these instructions to test locally in mock if your package builds with Python 3.10:

Let us know here if you have any questions.

Python 3.10 will be included in Fedora 35. To make that update smoother, we're building Fedora packages with early pre-releases of Python 3.10.
A build failure prevents us from testing all dependent packages (transitive [Build]Requires), so if this package is required a lot, it's important for us to get it fixed soon.
We'd appreciate help from the people who know this package best, but if you don't want to work on this now, let us know so we can try to work around it on our side.

Comment 1 Ben Cotton 2021-02-09 15:25:40 UTC
This bug appears to have been reported against 'rawhide' during the Fedora 34 development cycle.
Changing version to 34.

Comment 2 Basil Eric Rabi 2021-04-15 02:27:41 UTC
Made a pull request upstream (

Comment 3 Miro Hrončok 2021-06-04 20:13:26 UTC
This is a mass-posted update. Sorry if it is not 100% accurate to this bugzilla.

The Python 3.10 rebuild is in progress in a Koji side tag. If you manage to fix the problem, please commit the fix in the rawhide branch, but don't build the package in regular rawhide.

You can either build the package in the side tag, with:

    $ fedpkg build --target=f35-python

Or you can the build and we will eventually build it for you.

Note that the rebuild is still in progress, so not all (build) dependencies of this package might be available right away.


See also

If you have general questions about the rebuild, please use this mailing list thread:

Comment 4 Miro Hrončok 2021-06-07 22:58:15 UTC
The f35-python side tag has been merged to Rawhide. From now on, build as you would normally build.

Comment 5 Miro Hrončok 2021-06-14 10:35:37 UTC
This package was successfully rebuilt with Python 3.10.

If you need this bugzilla open for tracking purposes, sorry for the automatic closing: feel free to reopen it.

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