Update:
Unfortunately, the dependency chain doesn't stops here.
We need 'crunch', a texture compression tool.
Initial packaging: https://salsa.debian.org/twolife/crunch-dxtc
We need the Xolonium font.
Initial packaging: https://salsa.debian.org/twolife/fonts-xolonium
And we need another tool to build that custom Xolonium font, 'htic'.
Initial packaging: https://salsa.debian.org/twolife/htic
All those dependencies are in sid now.
I have an updated darkplaces engine that links to d0-blind-id at
https://salsa.debian.org/twolife/darkplaces
I started working on a package that rebuild the gamecode with gmqcc and
compress the tga textures to the optimized dds format with crunch-dxtc.
But, very unfortunately, it seems that Xonotic upstream have been
releasing something that cannot be redistributed for the past 10 years:
https://gitlab.com/xonotic/xonotic-data.pk3dir/-/work_items/3016
I stopped my efforts until this is resolved on their side.
br,
Sébastien