Hi we had a report on the gentoo-science mailing list that one of the data filea for pari: seadata.tgz has been updated upstream and a copy fetched at the SRC_URI doesn't match the Manifest. This file is unfortunately unversioned. The copy currently mirrored by gentoo should be updated and the pari Manifest will also need updating. A list of the optional packages along with md5 checksum can be found in the attached URL.
I redistributed the new seadata.tgz to the mirrors and put a new manifest into CVS. This should propagate within a few hours. Please reopen if the problem persists.