Compiling and installing lilypond from today's git repository, without
changing anything else in my font configuration, I get a Fontconfig
error (I've inserted some empty lines for better visibility).
```
Creating font configuration...
Adding fontconfig configuration file:
/usr/local/share/lilypond/2.25.5/fonts/00-lilypond-fonts.conf
Adding fontconfig configuration file: /etc/fonts/fonts.conf
Adding fontconfig configuration file:
/usr/local/share/lilypond/2.25.5/fonts/99-lilypond-fonts.conf
Adding font directory: /usr/local/share/lilypond/2.25.5/fonts/otf
Building font database...
Creating font configuration...
Adding fontconfig configuration file:
/usr/local/share/lilypond/2.25.5/fonts/emmentaler-font.conf
Fontconfig error: No writable cache directories
Adding font directory: /usr/local/share/lilypond/2.25.5/fonts/otf
Building font database...
```
This looks fishy...
Werner
