Hello Adrian,
i added llvm-11 to the build depends and it is listed, when i start the building process:
Build-Depends: autotools-dev, debhelper (>= 9.20160114), autoconf2.13, libx11-dev, libx11-xcb-dev, libxt-dev, libgtk-3-dev, libgtk2.0-dev (>= 2.10), libglib2.0-dev (>= 2.16.0), libstartup-notification0-dev, libjpeg-dev, zlib1g-dev, libreadline-dev, python2.7, python2-minimal (>= 2.6.6-13~), python3, python-ply, dpkg-dev (>= 1.16.1.1~), libnspr4-dev (>= 2:4.19~), libnss3-dev (>= 2:3.38~), libsqlite3-dev (>= 3.24.0), libvpx-dev (>= 1.5.0), libdbus-glib-1-dev, libffi-dev, libevent-dev (>= 1.4.1), libjsoncpp-dev, libpulse-dev, libasound2-dev, yasm (>= 1.1), rustc (>= 1.24), cargo (>= 0.25), llvm-11-dev, libclang-11-dev, clang-11, llvm-11, zip, unzip, locales, xvfb, xfonts-base, xauth, ttf-bitstream-vera, fonts-freefont-ttf, fonts-dejima-mincho, iso-codes
However this didn't change anything regarding the error...
Regards,
Connor