Grab both the "orig" tarball and one of the matching "debian" tarballs from http://ppa.launchpad.net/terry.guo/gcc-arm-embedded/ubuntu/pool/main/g/gcc-arm-none-eabi/
I've used the "precise" one, as that's reasonably old and should work on Debian.
Untar the orig tarball, cd into the resulting directory, then untar the "debian" tarball. This will result in a nice
You can change the changelog if you want with
Then just build it
dpkg-buildpackage -uc -us -sa
When the build is complete, you'll find your nice debian package one level up, just like usual.