http://bugs.winehq.org/show_bug.cgi?id=32383
--- Comment #2 from Anton Vorobyov phoenix@mail.ru 2012-12-08 12:22:39 CST --- Thanks, this resolved my issue. Would be cool if wine could do it automatically tho.
Severity of issue is even lesser though, as when satisfying further dependencies Debian removed 64-bit fontconfig and installed 32-bit one, thus making this prefix unneeded for configuring (in theory, actually you need it to get full list of deps). This may change in future tho, as far as i understand.