Compile current NextCloud desktop with Qt 5.15.2 on Ubuntu 22

That repo is gone.

Anyone else have tips for (hopefully easy) compiling of Nextcloud Desktop on Ubuntu 22.04, but with Qt6?

I tried

apt source nextcloud-desktop
sudo apt build-dep nextcloud-desktop
debuild -b -uc -us

based on this tutorial but the last step fails with some not-very-helpful error message:

Source file was:
int main() { return 0; }
dh_auto_configure: error: cd obj-x86_64-linux-gnu && cmake -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=None -DCMAKE_INSTALL_SYSCONFDIR=/etc -DCMAKE_INSTALL_LOCALSTATEDIR=/var -DCMAKE_EXPORT_NO_PACKAGE_REGISTRY=ON -DCMAKE_FIND_USE_PACKAGE_REGISTRY=OFF -DCMAKE_FIND_PACKAGE_NO_PACKAGE_REGISTRY=ON -DCMAKE_INSTALL_RUNSTATEDIR=/run "-GUnix Makefiles" -DCMAKE_VERBOSE_MAKEFILE=ON -DCMAKE_INSTALL_LIBDIR=lib/x86_64-linux-gnu -DCMAKE_INSTALL_PREFIX=/usr -DQUICK_COMPILER=ON -DUNIT_TESTING=ON -DEXTERNAL_VERSION=3.15.0-20241127.174710.eb04ac921-1.0\~jammy1 -DPLUGIN_INSTALL_DIR=/usr/lib/x86_64-linux-gnu/qt6/plugins -DBUILD_UPDATER=OFF .. returned exit code 1
make[1]: *** [debian/rules:10: override_dh_auto_configure] Error 2
make[1]: Leaving directory '/home/user/nextcloud-desktop-3.15.0-20241127.174710.eb04ac921'
make: *** [debian/rules:7: binary] Error 2
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2
debuild: fatal error at line 1182:
dpkg-buildpackage -us -uc -ui -b failed

I want to compile it myself because of Dup icons in desktop client on ubuntu 22.04 .