/etc/anthy/anthy-conf is in anthy-common 1:0.3-6ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | #
prefix /usr
datarootdir ${prefix}/share
datadir ${datarootdir}
ANTHYDIR ${datarootdir}/anthy/
DIC_FILE ${datarootdir}/anthy/anthy.dic
ZIPDICT_EUC ${datarootdir}/anthy/zipcode.t
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