I use a similar setup. I try to find a better setup.

I'm not a developer, I just play around with code in my spare time. So I do not need more… Perhaps you could try ArchLinux, there is always a current version of Qt and KDE present and it does not require to install seperated header files as they are automatically shipped with the packages. That's what I am using as my daily driver and it is more stable than e.g. Kubuntu.

Well, I was just asking the CPU, I'm curious what is a good setup to build KDE comfortably, in a good amount of time.
I don't like Ubuntu and its derivatives, I use Sabayon and I love it, but KDE Neon was the devs choice, apparently, as it is stated this is the KDE distro, so I have made a VM and started to build. It worked three months ago, I can't tell why it does not work anymore (that bothers me) and what is a good config, not the best, but fast enough. I have an i7 920 that looks pretty old.

I cannot recommend my CPU (homeserver has an Intel Xeon E3-1230). It is affected by so many bugs that virtualization suffers a lot. I can understand why you don't like Ubuntu and derivates. The cleaning up after installation takes longer then setting it up. Never tried Sabayon though, but gentoo is great, but consumes too much time.

I started a refresh-build of plasma-desktop including the buiild of qt5 without providing it anywhere. Perhaps I can find anything „special“.

My i7 920 is the son of a Xeon . Sabayon is a precompiled Gentoo. Being rolling release, I am fascinated by its quality. The package management is very powerful too. The selection of packages is not always large, but enough, they also add some if you need to. They are very responsive.

Rebuild finished.

Code: Select all

time ./kdesrc-build --refresh-build plasma-desktop
…
real    177m7,857s
user    301m21,784s
sys     29m22,415s


But: the build failed with the same error message as yours. Got it

The Qt5-build-directory contains a list what is configured to compile: `less ~/kde/src/log/latest/Qt5/configure.log`
I read https://wiki.qt.io/Building_Qt_5_from_Git#Linux.2FX11, https://doc.qt.io/qt-5/linux-requirements.html and the licensing stuff.

After compiling this Qt5 manually, kdesrc fails to build Qt due to the LGPL license. I think this could be related, but I do not know where to search as Qt5 X11 Extras are available in a free license too. The old manual compiling with qt5.15.1 had x11extras AND the open source licensing.

It seems to be a bug, but I couldn't find a matching report and I do not know what causes this to fail. I'll just disable the build of qt and use my manual provided one as this compiles fine.

Thank you ! Indeed, I think it's a kdesrc-build parametrization that fails.