Missing symlink, probably. According to the MANIFEST, in package /l/at-spi2-atk-2.6.2-i486-1.txz, there is a file /usr/lib/libatk-bridge-2.0.so.0.0.0 but no /libatk-bridge-2.0.so.0.
To check, make the symlink yourself and see if that works:
ln -s /usr/lib/libatk-bridge-2.0.so.0.0.0 /usr/lib/libatk-bridge-2.0.so.0
EDIT Didn't see ponce's answer before posting, now I'm not sure. Won't hurt trying, anyway