Thanks for the quick reply.
Neither of those suggestions worked. When I attempt to rebuild the database, I receive this message:
# rpm --rebuilddb
error: db4 error(16) from dbenv->remove: Device or resource busy
(Before this, I also removed the __db* files from /var/lib/rpm.)
When I attempt cleaning up libtool-libs, it installs fine, but I still receive the original dependency error for libltdl:
# rpm -Uvh libltdl-1.4.2-12.i686.rpm
warning: libltdl-1.4.2-12.i686.rpm: V3 DSA signature: NOKEY, key ID f9651d5a
error: Failed dependencies:
libtool-libs = 1.4.3-5 is needed by (installed) libtool-1.4.3-5
Thanks again for any help you can provide.