/usr/share/aide/config/aide/aide.conf.d/31_aide_rkhunter is in aide-common 0.16~a2.git20130520-2.
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 8 | /var/lib/rkhunter/db/(mirrors|rkhunter_prop_list)\.dat$ VarTime
/var/lib/rkhunter/tmp/(group|passwd)$ VarFile
/var/lib/rkhunter/(db|tmp)$ VarDir
/var/log/rkhunter\.log$ Log
/var/log/rkhunter\.log\.1$ LowLog
/var/log/rkhunter\.log\.2\.gz$ LoSerMemberLog
/var/log/rkhunter\.log\.3\.gz$ SerMemberLog
/var/log/rkhunter\.log\.4\.gz$ HiSerMemberLog
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