The archive was compressed with an old version of bzip2.
$ wget -q -i - <<EOT
http://www.open-mpi.org/software/ompi/v1.3/downloads/openmpi-1.3.4.tar.bz2
http://snapshot.debian.net/archive/2005/03/13/debian/pool/main/b/bzip2-old/bzip2-old_0.9.5d.orig.tar.gz
EOT
$ printf '978c29f3b671856daa0fc67459b73e01 openmpi-1.3.4.tar.bz2\n' \
| md5sum -c
$ tar xzf bzip2-old_0.9.5d.orig.tar.gz
$ (cd bzip2-0.9.5d && make)
$ bzcat openmpi-1.3.4.tar.bz2 \
| bzip2-0.9.5d/bzip2 \
| cmp - openmpi-1.3.4.tar.bz2
Browsing the upstream changelog, version 1.0 -- coming right after 0.9.5d
-- can be suspected to have introduced the current format:
* Minor sorting enhancements from my DCC2000 paper.
http://doi.ieeecomputersociety.org/10.1109/DCC.2000.838157
Cheers,
lacos
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