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Here we take the example of the package mame, which exists in Debian Sid, but not in the stable release. We don't need to be root !
Install Debian SDK
su -c "apt-get install devscripts build-essential"
Download the .dsc file from the sid release
From your web browser at http://packages.debian.org/sid/mame, look at the dsc file or:
dget -x http://ftp.de.debian.org/debian/pool/non-free/m/mame/mame_0.142-1.dsc
Install dependencies as found in debian/control
cd mame-0.142 grep Build-Depends debian/control Build-Depends: debhelper (>= 8), libexpat1-dev, libsdl1.2-dev, zlib1g-dev, libxinerama-dev, libgconf2-dev, libgtk2.0-dev, libsdl-ttf2.0-dev su -c "apt-get install debhelper libexpat1-dev libsdl1.2-dev zlib1g-dev libxinerama-dev libgconf2-dev libgtk2.0-dev libsdl-ttf2.0-dev"
Indicate in the changelog a backport revision number
dch --bpo
Write something like "my first backport" and save the file.
This will add something like ~bpo60+1 to the package version number. The tilde ~ makes the package inferior in version, which should allow a proper package upgrade when you upgrade to the next debian release.
Test if we can successfully build the package
fakeroot debian/rules binary
Build a package properly , without GPG signing the package
dpkg-buildpackage -us -uc
Install and enjoy !
su -c "dpkg -i ../mame_0.142-1_amd64.deb"