fontconfig

Prefer autoreconf -vfis to ./autogen.sh as the latter requires gettext
Do not remove src/fcobjshash.gperf.h as it breaks the build
src/fcobjshash.h does not exist (generated by gperf)
Does not build with muon
Requires gperf; kiss provides fcobjshash.h to remove gperf dependency
The default cache dir is /var/cache/fontconfig
Consider disabling non-scalable fonts (e.g. bitmap fonts)
Prefer expat to libxml2 as it is smaller (and faster)
- gentoo purposely dropped libxml2 support
- arch and chimera are using expat by default
The default hinting configuration is slight
Do we need to change the default sub-pixel rendering to rgb or noinstall?
Do we need to explicitly specify --with-cache-dir=/var/cache/$nom
Void does:

# deprecated upstream, but is broken unless 70-no-bitmaps-except-emoji exists in conf.d
rm "$DESTDIR"/usr/share/fontconfig/conf.avail/70-no-bitmaps.conf
ln -s 70-no-bitmaps-except-emoji.conf "$DESTDIR"/usr/share/fontconfig/conf.avail/70-no-bitmaps.conf

Chimera does:

self.install_file(
    self.files_path / "70-no-nonscalable.conf",
    "usr/share/fontconfig/conf.avail",
)
# reject bitmap fonts by default, preventing them from being preferred
self.install_link(
    "etc/fonts/conf.d/70-no-nonscalable.conf",
    "../../../usr/share/fontconfig/conf.avail/70-no-nonscalable.conf",
)

fontconfig

References