How to upgrade TigerVNC to 1.12 on Debian 11?

I have a development machine running Debian 11, which is currently our standard environement for equipment hosts. I use VNC (TigerVNC server) to access it remotely from my work computer. The problem is that TigerVNC that comes with Debian 11 has a very annoying bug , that interferes with my work. The bug has been long fixed, but there is no official backport and backports for Debian 11 are EOLed to my knowledge. So the only way to get the fix is to backport TigerVNC manually. I tried to follow the backporting guide by Faheem Mitha , because it appears to be the most suitable method for this case, which requires Debian-specific configuration and build. I manage to get up to Step 4: debuild -uc -us dpkg-buildpackage -us -uc -ui dpkg-buildpackage: info: source package tigervnc dpkg-buildpackage: info: source version 1.12.0+dfsg-8~bpo11+1 dpkg-buildpackage: info: source distribution bullseye-backports dpkg-buildpackage: info: source changed by dpkg-source --before-build . dpkg-buildpackage: info: host architecture amd64 dpkg-source: info: using options from tigervnc-1.12.0+dfsg/debian/source/options: --single-debian-patch --create-empty-orig dpkg-checkbuilddeps: error: Unmet build dependencies: libxft-dev libxcursor-dev libxrandr-dev libxdamage-dev libwrap0-dev xorg-server-source (>= 2:21) xserver-xorg-dev appstream quilt bison flex x11proto-dev (>= 2021.5) libxcvt-dev libxfont-dev (>= 1:2.0.1) libxkbfile-dev (>= 1:0.99.1) libpciaccess-dev (>= 0.12.901) libgcrypt-dev libudev-dev (>= 151-3) libselinux1-dev (>= 2.0.80) libaudit-dev libdrm-dev (>= 2.4.107-5~) mesa-common-dev libunwind-dev libxmuu-dev (>= 1:0.99.1) libxrender-dev (>= 1:0.9.0) libxi-dev (>= 2:1.8) libxpm-dev (>= 1:3.5.3) libxaw7-dev (>= 1:0.99.1) libxmu-dev (>= 1:0.99.1) libxtst-dev (>= 1:0.99.1) libxres-dev (>= 1:0.99.1) libxfixes-dev (>= 1:3.0.0) libxv-dev libxinerama-dev libxshmfence-dev (>= 1.1) libepoxy-dev libegl-dev (>= 1.3.2) libgbm-dev (>= 10.2) libbsd-dev libdbus-1-dev (>= 1.0) libsystemd-dev dpkg-buildpackage: warning: build dependencies/conflicts unsatisfied; aborting dpkg-buildpackage: warning: (Use -d flag to override.) debuild: fatal error at line 1182: dpkg-buildpackage -us -uc -ui failed sudo apt-get build-dep tigervnc-standalone-server=1.12.0+dfsg-8 Reading package lists... Done Picking 'tigervnc' as source package instead of 'tigervnc-standalone-server' Reading package lists... Done Building dependency tree... Done Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: builddeps:tigervnc : Depends: xorg-server-source (>= 2:21) but 2:1.20.11-1+deb11u14 is to be installed Depends: x11proto-dev (>= 2021.5) but 2020.1-1 is to be installed Depends: libxcvt-dev but it is not installable Depends: libdrm-dev (>= 2.4.107-5~) but 2.4.104-1 is to be installed Depends: libxi-dev (>= 2:1.8) but 2:1.7.10-1 is to be installed E: Unable to correct problems, you have held broken packages. However, I don't understand from the guide what exactly I am supposed to do about unmet dependencies. Am I supposed to lower the required version in debian/control? And in particular, how do I handle libxcvt-dev that is marked uninstallable?