on Windows I'm using prebuilt fontconfig binaries provided by the MSYS2 project. I want my app to run on systems without MSYS2, however, so I can't use the default fontconfig directories hard-coded into MSYS2's fontconfig build because they only exist if MSYS2 is installed. Luckily, I can use the environment variables FONTCONFIG_FILE and FONTCONFIG_PATH to override the MSYS2-specific configuration in the prebuilt fontconfig binaries and set my own directories for fontconfig this way.However, I don't seem to find a way to set the path where fontconfig stores its cache files. It always uses the path hard-coded in the binary but this only exists if MSYS2 is installed. Is there any way to override the MSYS2 cache directory or do I have to build fontconfig myself to do that?
In vanilla Fontconfig builds, you can set the XDG_CACHE_HOME variable to modify the cache location. Whether your MSYS2 build will respect that depends on how the MSYS2 people have patched Fontconfig.
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