While using rpm-4.3-0.20031227.1 from HEAD I got this (sorry for 
polish language of messages):
1:iptables               ########################################### 
bÅÄd: rozpakowanie archiwum nie powiodÅo siÄ na pliku 
/usr/lib/iptables: cpio: lsetfilecon nie powiodÅo siÄ
               -Operacja nie obsÅugiwana

Operacja nie obslugiwana ~= Operation not supported.

This happened because my /usr is on XFS filesystem which doesn't 
support selinux xattr, yet.

This needs to be handled somehow: one proposition is if 
(security_getenforce() > 0) && lsetfilecon failed then exit as above 
else work as nothing happened (maybe display some error message).

ps. policy loaded but not enforced, kernel 2.6.0