Your can build you own Debian package from the git repository following this:
Required tools
sudo apt-get install git devscripts pgpgpg debhelper
Main repository
git clone http://mumudvbgit.braice.net/mumudvb upstream
If you want more information about git you can have a look to the Git tutorial or the Git faq
Debian repository
MuMuDVB is packaged for Debian. The git repository for the Debian package is available here.
git clone git://git.debian.org/git/pkg-vdr-dvb/dvb/mumudvb.git
Building Debian package
Replace 1.6.1b-20110426 by the package version from Git.
cp -r debian/debian/ upstream
cd upstream
autoreconf -i -f
./configure
make doc
sed -i 's/1.6-1/1.6.1b-20110426/' debian/changelog
debuild -i -us -uc -b
cd ..
The .deb will be in the parent directory.