Embedded libjpeg & libtiff
==========================
The xdvipsk program links statically with libjpeg & libtiff. I've reported
at upstream [1], that I would like to have dynamic linking with both libs
and they seem to be inclined to implement this.

64bit zziplib library
=====================
The luamatex binary requires 64bit functions even on 32bit Intel when
building with zziplib. TL upstream seems to build zziplib to provide the
64bit interface [2]. This is not the case for the zziplib package in
Debian, hence we use the zziplib embedded TL lib on i386.
This needs to be addressed somehow. My wild guess is, that the zziplib
packages in Debian need to provide the 64bit functions.

[1] https://github.com/vtex-soft/xdvipsk/issues/18
[2] https://github.com/gdraheim/zziplib/blob/master/docs/64on32.htm.md