[tlbuild] building for distribution with shared breaks in dvisvgm

[Martin Gieseking]

Hi Karl and Norbert,

a couple of weeks ago, a Gentoo maintainer asked me to add a 
configuration option to disable the bundled libraries and to link 
against the corresponding system libs instead [1]. So I added
--enable-bundled-libs (and --disable-bundled-libs) to the configure 
script which affects brotli, potrace, woff2, and xxhash.
I checked a couple of Linux distros previously if they provide these 
libraries but obviously overlooked Debian not having the original xxhash 
[2] but only the Go port. Sorry for that. Would it be an option to add 
the missing package to Debian? It's already used by many different 
projects and probably worth to have it packaged.


> Norbert: Without --enable-bundled-libs, my surprise is more that clipper
> is included than xxhash is not. But I don't know Martin's intent for the
> different libraries.

The bundled clipper library is a slightly modified version. I extended 
some structures to store information required to reconstruct curved path 
segments from the straight line segments processed by clipper. 
Therefore, we can't use the system library here.

Best,
Martin


[1] https://github.com/mgieseki/dvisvgm/issues/90
[2] https://cyan4973.github.io/xxHash