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dspdfviewer is included in
jessie-backports. Information on what
backports is and how to use it is found on backports instructions,
but to get started, try these commands (make sure to replace
deb.debian.org with your preferred debian mirror!)
As a side effect, you can now access more recent versions.
If you already had jessie-backports activated, a
apt-get install dspdfviewer is enough.