Andrew seems to load the configuration file for fontconfig directly:
https://github.com/trimental/andrew/blob/30a2d2487e726520cfcf8a2e615fefab697649c7/src/text/fontconfig.rs#L15
This will obviously cause problems on systems that do not have the file in that location. Like Clear Linux for example: clearlinux/distribution#639
Instead, the fontconfig provided function should be called to load the configuration file.