e.g.
/usr/local/bin/gi-docgen generate --quiet --fatal-warnings \
--config doc/libgweather.toml --output-dir=doc/libgweather-4.0 \
--no-namespace-dir \
--content-dir=/hack/objdirs/pobj/libgweather4-4.0.0/libgweather-4.0.0/doc \
libgweather/GWeather-4.0.gir
WARNING: Unable to process dot data: b'Fontconfig error:
No writable cache directories\nFontconfig error: No writable cache directories\n'
This happens if there's an empty directory under one of the fontconfig paths
(most likely /usr/local/share/fonts/) which probably happens during dpb(1)
junking (which is why it doesn't happen in every bulks).
issue reported by several over the past months (most notably naddy@ and tb@)
a3144d4666