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To describe:

Backporting

These instructions were tested successfully in 3/2012

There is yet not BOINC package in Debian backports. Here is to create one for it

Retrieve old source code

git clone git://anonscm.debian.org/pkg-boinc/scripts.git
cd scripts
./export-boinc -r 6.12.43
mv ./boinc_6.12.43+dfsg.orig.tar.gz ..
cd ..

Untar it and get current Debian build instructions in

tar xzvf ./boinc_6.12.43+dfsg.orig.tar.gz
git clone git://anonscm.debian.org/pkg-boinc/boinc.git
cd boinc-6.12.43+dfsg
cp -r ../boinc/debian .

So, it seems like those backports are closer to upstream than anyone may expect.