<![CDATA[Having trouble building Qt 6 from source]]>Hey recently I've been trying to build Qt from source but lately I've had a bit of trouble.

I got through the ./configure part but I seem to be having trouble with the building process.
from what I'm seeing in the terminal I think i got through the first half of the build process just fine as it sent the message:
"Done. Made 25070 targets from 3566 files in 31434ms"
but when it started prompting ninja for the build process, midway through I got these specific lines
"- AutoMoc: /home/<self>/Documents/file-building/QTBUILD/incas/qt-everywhere-src-6.10.2/qtserialbus/src/serialbus/qcanframeprocessor.h: note: No relevant classes found. No output generated.

  • [11943/12791] Generating wayland-wayland-server-protocol.h

-%3Cstdin%3E:2307: element event: validity error : No declaration for attribute deprecated-since of element event "

and then right after that i got the error
WARNING: XML failed validation against built-in DTD
about 4 times.

I'm pretty sure the build process failed as the convenience script to configure the build didn't work after i inputted it
I'm pretty sure I have all the correct dependencies in order so I don't know what exactly caused this error, and theres not a lot of good info on building Qt on linux so any help from here would be much appreciated.

(For further specification I am using Ubuntu Studio as my linux distro)

]]>https://forum.qt.io/topic/164349/having-trouble-building-qt-6-from-sourceRSS for NodeSun, 17 May 2026 10:53:57 GMTSun, 01 Mar 2026 18:20:22 GMT60<![CDATA[Reply to Having trouble building Qt 6 from source on Sat, 16 May 2026 19:09:42 GMT]]>In that case, I would use a virtual environment with the stuff specific to Qt.

]]>https://forum.qt.io/post/838269https://forum.qt.io/post/838269Sat, 16 May 2026 19:09:42 GMT<![CDATA[Reply to Having trouble building Qt 6 from source on Mon, 16 Mar 2026 15:56:25 GMT]]>Do any of you know how I can install these dependencies on ubuntu? I've tried pip install which is the general way to do it but doing so would cause conflicts on my OS, and I can't seem to find apt packages that have the equivalent to what I need. any helpful response would be appreciated

]]>https://forum.qt.io/post/837133https://forum.qt.io/post/837133Mon, 16 Mar 2026 15:56:25 GMT<![CDATA[Reply to Having trouble building Qt 6 from source on Mon, 16 Mar 2026 15:17:07 GMT]]>@SkeletonHorse Do any of you think that the required python dependencies here might be causing my issues? I have a feeling they are, though I am having trouble downloading the packages via sudo apt install so I haven't been able to test it.

]]>https://forum.qt.io/post/837131https://forum.qt.io/post/837131Mon, 16 Mar 2026 15:17:07 GMT<![CDATA[Reply to Having trouble building Qt 6 from source on Fri, 13 Mar 2026 12:22:12 GMT]]>@GrecKo the errors are stated at the top of the post but for clarification I get
these messages:

AutoMoc: /home/<self>/Documents/<tmp>/<tmp>/qt-everywhere-src-6.10.2/qtserialbus/src/serialbus/qcanframeprocessor.h: note: No relevant classes found. No output generated.
[12263/12791] Generating wayland-wayland-server-protocol.h
%3Cstdin%3E:2307: element event: validity error : No declaration for attribute deprecated-since of element event

WARNING: XML failed validation against built-in DTD

during the build process

]]>https://forum.qt.io/post/837072https://forum.qt.io/post/837072Fri, 13 Mar 2026 12:22:12 GMT<![CDATA[Reply to Having trouble building Qt 6 from source on Thu, 12 Mar 2026 22:55:31 GMT]]>What errors do you encounter?

Those seems to be warnings.

]]>https://forum.qt.io/post/837061https://forum.qt.io/post/837061Thu, 12 Mar 2026 22:55:31 GMT<![CDATA[Reply to Having trouble building Qt 6 from source on Thu, 12 Mar 2026 20:55:13 GMT]]>if it means anything I did get this warning
while looking at the configure summary file:
"Required Python dependencies NOT found: spdx_tools.spdx.clitools.pyspdxtools"
While also getting this warning during the build process:
"WARNING: Support for linking against a C++ standard library other
than the one in-tree (buildtools/third_party/libc++) is deprecated
and support for this will end. We plan to remove this option in
M138."
Do you think any of these might be the source of my problem?

]]>https://forum.qt.io/post/837059https://forum.qt.io/post/837059Thu, 12 Mar 2026 20:55:13 GMT<![CDATA[Reply to Having trouble building Qt 6 from source on Mon, 09 Mar 2026 18:44:59 GMT]]>I have set it's value to one but I seem to have encountered the same build error.

]]>https://forum.qt.io/post/836987https://forum.qt.io/post/836987Mon, 09 Mar 2026 18:44:59 GMT<![CDATA[Reply to Having trouble building Qt 6 from source on Sun, 08 Mar 2026 16:10:56 GMT]]>--parallel 1

]]>https://forum.qt.io/post/836955https://forum.qt.io/post/836955Sun, 08 Mar 2026 16:10:56 GMT<![CDATA[Reply to Having trouble building Qt 6 from source on Sun, 08 Mar 2026 16:01:35 GMT]]>How do I set the value to 1?

]]>https://forum.qt.io/post/836954https://forum.qt.io/post/836954Sun, 08 Mar 2026 16:01:35 GMT<![CDATA[Reply to Having trouble building Qt 6 from source on Sat, 07 Mar 2026 19:50:04 GMT]]>Either remove parallel from the parameters or set its value to 1.

]]>https://forum.qt.io/post/836937https://forum.qt.io/post/836937Sat, 07 Mar 2026 19:50:04 GMT<![CDATA[Reply to Having trouble building Qt 6 from source on Fri, 06 Mar 2026 22:32:18 GMT]]>@SGaist I did build Qt with parrallel, though I dont undesrstand what you mean by building it "at 1" forgive me for my need for specifics, I just dont know much about qt and I'm building it for specific capabilites only available to such version.

Anyways could you elaborate on building it "at 1" ?

]]>https://forum.qt.io/post/836928https://forum.qt.io/post/836928Fri, 06 Mar 2026 22:32:18 GMT<![CDATA[Reply to Having trouble building Qt 6 from source on Thu, 05 Mar 2026 21:27:31 GMT]]>Currently I don't have any specifics in mind.

I just realized something, the Moc message is correct, QCanFrameProcessor is indeed not a QObject based class.

Can you build Qt with parallel at 1 ?

]]>https://forum.qt.io/post/836830https://forum.qt.io/post/836830Thu, 05 Mar 2026 21:27:31 GMT<![CDATA[Reply to Having trouble building Qt 6 from source on Wed, 04 Mar 2026 20:34:32 GMT]]>The summary file is pretty long, do I send it with the upload file option or are you just looking for specific parts of the file that I can relay to you?

]]>https://forum.qt.io/post/836778https://forum.qt.io/post/836778Wed, 04 Mar 2026 20:34:32 GMT<![CDATA[Reply to Having trouble building Qt 6 from source on Tue, 03 Mar 2026 08:51:39 GMT]]>That one yes

]]>https://forum.qt.io/post/836739https://forum.qt.io/post/836739Tue, 03 Mar 2026 08:51:39 GMT<![CDATA[Reply to Having trouble building Qt 6 from source on Mon, 02 Mar 2026 21:38:00 GMT]]>@SGaist as in the config.summary file written?

]]>https://forum.qt.io/post/836721https://forum.qt.io/post/836721Mon, 02 Mar 2026 21:38:00 GMT<![CDATA[Reply to Having trouble building Qt 6 from source on Mon, 02 Mar 2026 20:57:22 GMT]]>@SkeletonHorse said in Having trouble building Qt 6 from source:

I followed the exact documentation you sent me
i extracted the source code
did cd dev/qtbuild
did configure
did the make parallel command
and then got the errors i listed

Can you share the summary once configure has run ?

]]>https://forum.qt.io/post/836719https://forum.qt.io/post/836719Mon, 02 Mar 2026 20:57:22 GMT<![CDATA[Reply to Having trouble building Qt 6 from source on Mon, 02 Mar 2026 20:56:46 GMT]]>@SkeletonHorse said in Having trouble building Qt 6 from source:

also is there any way to edit a post after an hour i accidentally left my system name when writing this forum post before going back to bed and it wont let me change it and im unsure if i want to leave that data just out there for random people to see on the internet and such

Fixed

]]>https://forum.qt.io/post/836718https://forum.qt.io/post/836718Mon, 02 Mar 2026 20:56:46 GMT<![CDATA[Reply to Having trouble building Qt 6 from source on Mon, 02 Mar 2026 20:47:25 GMT]]>also is there any way to edit a post after an hour i accidentally left my system name when writing this forum post before going back to bed and it wont let me change it and im unsure if i want to leave that data just out there for random people to see on the internet and such

]]>https://forum.qt.io/post/836716https://forum.qt.io/post/836716Mon, 02 Mar 2026 20:47:25 GMT<![CDATA[Reply to Having trouble building Qt 6 from source on Mon, 02 Mar 2026 20:31:28 GMT]]>I followed the exact documentation you sent me
i extracted the source code
did cd dev/qtbuild
did configure
did the make parallel command
and then got the errors i listed

]]>https://forum.qt.io/post/836714https://forum.qt.io/post/836714Mon, 02 Mar 2026 20:31:28 GMT<![CDATA[Reply to Having trouble building Qt 6 from source on Mon, 02 Mar 2026 20:25:23 GMT]]>Can you please list the exact steps you used ?
Also, did you re-start from a clean set of sources ?

]]>https://forum.qt.io/post/836713https://forum.qt.io/post/836713Mon, 02 Mar 2026 20:25:23 GMT<![CDATA[Reply to Having trouble building Qt 6 from source on Mon, 02 Mar 2026 20:20:37 GMT]]>I don't understand i did cd in dev/qt-build before doing configure like the documentation said i dont know how id be doing it wrong

]]>https://forum.qt.io/post/836712https://forum.qt.io/post/836712Mon, 02 Mar 2026 20:20:37 GMT<![CDATA[Reply to Having trouble building Qt 6 from source on Mon, 02 Mar 2026 20:04:41 GMT]]>If you are meaning calling configure from the root of the Qt sources, then yes, that is wrong.
As already written, do an out of source build just as explained in the documentation.

]]>https://forum.qt.io/post/836709https://forum.qt.io/post/836709Mon, 02 Mar 2026 20:04:41 GMT<![CDATA[Reply to Having trouble building Qt 6 from source on Mon, 02 Mar 2026 20:01:55 GMT]]>@SGaist do you mean as in like doing it in the file directory itself? as i did cd in the directed file directory before i did configure

]]>https://forum.qt.io/post/836708https://forum.qt.io/post/836708Mon, 02 Mar 2026 20:01:55 GMT<![CDATA[Reply to Having trouble building Qt 6 from source on Sun, 01 Mar 2026 19:53:38 GMT]]>Hi and welcome to devnet,

From the look of ./configure you are doing a build within the first level of the sources. Don't.
Do an out of source build.
It's shown in the Linux building guide.

]]>https://forum.qt.io/post/836693https://forum.qt.io/post/836693Sun, 01 Mar 2026 19:53:38 GMT