Install git:

# sudo apt-get install git
# sudo apt-get install libusb-dev
# sudo apt-get install libgtk-3-dev

Download the latest sources of sane:

# mkdir sane
# cd sane 
# mkdir frontend
# mkdir backend
# cd backend 
# git init
# git clone git://git.debian.org/sane/sane-backends.git
# cd ../frontend
# git init
# git clone git://git.debian.org/sane/sane-frontends.git

Now, compile the backend:

# cd backend/sane-backends
# configure
# make
# sudo make check
# sudo make install
# cd frontend/sane-frontends
# configure
# sudo make install

Before installing sane, remove the existing sane instalation (just in case):

# sudo apt-get remove sane
# sudo apt-get remove xsane

Install saned:

# cd backend/sane-backends
# sudo make install
# cd frontend/sane-frontends
# sudo make install

Now, start saned (sane daemon). Edit the file /etc/default/saned and set run as yes:

# Set to yes to start saned
RUN=yes

And run the daemon:

# sudo /etc/rc.d/saned start 

Unfortunately, this doesn't work in my case.