build Debian package "chromium 108" on Debian Buster

I am trying to build chromium 108 for Debian Buster. The package only exists for Debian Bullseye, so on my Debian Buster build machine, I need to change the /etc/apt/sources.list to bullesyse and download sources: apt-get source chromium After that I change sources.list back to buster. I cd to the directory and try dpkg-buildpackage: cd chromium-108.0.5359.94 dpkg-buildpackage --build=binary --no-sign Few build dependencies where missing, but I could install them from Buster repository. Only 2 packages do not exist in buster: generate-ninja libpipewire-0.3-dev I was able to install generate-ninja from Bullseye without problems, and grepping the tree for pipewire shows in ./debian/changelog * Enable pipewire support in webrtc (closes: #954824). which looks like some non-essential feature, so I will try to remove pipewire from build dependencies: remove line 66 from debian/control: -libpipewire-0.3-dev, and remove line 91 from debian/rules -rtc_use_pipewire=true \ Now I can start the build process again and it runs for a while: dpkg-buildpackage --build=binary --no-sign until I get following error: 5546/54816] ACTION //third_party/blink/renderer/bindings:generate_bindings_all(//build/toolchain/linux/unbundle:default) ninja: build stopped: subcommand failed. make: *** [debian/rules:125: override_dh_auto_build-arch] Error 1 make: Leaving directory '/mnt/src/chromium-108.0.5359.94' make: *** [debian/rules:112: binary] Error 2 dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2 Full output here: https://ctxt.io/2/AACQ8LyZEw How can I fix this error?