"LOCAL_APPDATA_FONTCONFIG_CACHE" seems like a good location for the cachedir, too (it was mentioned here: http://thread.gmane.org/gmane.comp.fonts.fontconfig/4738).
I didn't work in my Inkscape 0.48.4 though (probably it uses an older fontconfig version)
"LOCAL_ APPDATA_ FONTCONFIG_ CACHE" seems like a good location for the cachedir, too (it was mentioned here: http:// thread. gmane.org/ gmane.comp. fonts.fontconfi g/4738).
I didn't work in my Inkscape 0.48.4 though (probably it uses an older fontconfig version)