debian installation

hi! i've problems installing matplotlib under debian with packages
provided at mentors.debian.net.

I added these lines to my sources.list :
       deb http://mentors.debian.net/debian unstable main contrib non-free
       deb-src http://mentors.debian.net/debian unstable main contrib
non-free

But apt says it can't find binary packages at mentors.debian.net.
Infact, the repository at mentors.debian.net contains only a "source"
directory, not a binary one. So I removed the first line, and went on
compiling from source.
I run:
apt-get build-dep python-matplotlib
apt-get source --compile python-matplotlib

The compile command termed with exit status 1 and the process failed.

Here the complete output:

apt-get source --compile python-matplotlib
Lettura della lista dei pacchetti in corso... Fatto
Generazione dell'albero delle dipendenze in corso... Fatto
� necessario prendere 1646kB di sorgenti
Get:1 http://mentors.debian.net unstable/main python-matplotlib 0.61.0-1
(dsc) [761B]
Get:2 http://mentors.debian.net unstable/main python-matplotlib 0.61.0-1
(tar) [1641kB]
Get:3 http://mentors.debian.net unstable/main python-matplotlib 0.61.0-1
(diff) [4066B]
Scaricato 3B in 0s (4B/s)
Si � saltata l'estrazione del sorgente gi� estratto in
python-matplotlib-0.61.0
dpkg-buildpackage: source package is python-matplotlib
dpkg-buildpackage: source version is 0.61.0-1
dpkg-buildpackage: source changed by Vittorio Palmisano <redclay@...230...>
dpkg-buildpackage: host architecture i386
  debian/rules clean
dh_testdir
dh_testroot
rm -f *-stamp
rm -rf doc build setupext.pyc
dh_clean
  debian/rules build
make: Nothing to be done for `build'.
  debian/rules binary
dh_testdir
dh_testroot
dh_clean -k
dh_testdir
python ./setup.py build
running build
running build_py
creating build
creating build/lib.linux-i686-2.3
creating build/lib.linux-i686-2.3/matplotlib
copying matplotlib/patches.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/numerix.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/colors.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/transforms.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/finance.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/dates.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/cm.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/windowing.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/pyparsing.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/collections.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/na_imports.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/legend.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/text.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/afm.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/mlab.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/matlab.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/figure.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/table.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/nc_imports.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/font_manager.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/image.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/backend_bases.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/cbook.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/_matlab_helpers.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/_mathtext_data.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/mathtext.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/ticker.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/axes.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/axis.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/__init__.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/artist.py -> build/lib.linux-i686-2.3/matplotlib
copying matplotlib/lines.py -> build/lib.linux-i686-2.3/matplotlib
creating build/lib.linux-i686-2.3/matplotlib/backends
copying matplotlib/backends/backend_template.py ->
build/lib.linux-i686-2.3/matplotlib/backends
copying matplotlib/backends/backend_agg.py ->
build/lib.linux-i686-2.3/matplotlib/backends
copying matplotlib/backends/backend_gtk.py ->
build/lib.linux-i686-2.3/matplotlib/backends
copying matplotlib/backends/backend_wxagg.py ->
build/lib.linux-i686-2.3/matplotlib/backends
copying matplotlib/backends/backend_svg.py ->
build/lib.linux-i686-2.3/matplotlib/backends
copying matplotlib/backends/backend_tkagg.py ->
build/lib.linux-i686-2.3/matplotlib/backends
copying matplotlib/backends/backend_gtkagg.py ->
build/lib.linux-i686-2.3/matplotlib/backends
copying matplotlib/backends/__init__.py ->
build/lib.linux-i686-2.3/matplotlib/backends
copying matplotlib/backends/backend_gd.py ->
build/lib.linux-i686-2.3/matplotlib/backends
copying matplotlib/backends/backend_paint.py ->
build/lib.linux-i686-2.3/matplotlib/backends
copying matplotlib/backends/backend_ps.py ->
build/lib.linux-i686-2.3/matplotlib/backends
copying matplotlib/backends/backend_wx.py ->
build/lib.linux-i686-2.3/matplotlib/backends
copying matplotlib/backends/tkagg.py ->
build/lib.linux-i686-2.3/matplotlib/backends
running build_ext
building 'matplotlib._transforms' extension
creating build/temp.linux-i686-2.3
creating build/temp.linux-i686-2.3/src
creating build/temp.linux-i686-2.3/CXX
gcc -pthread -fno-strict-aliasing -DNDEBUG -g -O3 -Wall
-Wstrict-prototypes -fPIC -Isrc -I. -I/usr/include/python2.3 -c
CXX/cxx_extensions.cxx -o build/temp.linux-i686-2.3/CXX/cxx_extensions.o
cc1plus: warning: command line option "-Wstrict-prototypes" is valid for
Ada/C/ObjC but not for C++
./CXX/Objects.hxx: In constructor
'Py::MapBase<T>::const_iterator::const_iterator(const Py::MapBase<T>*,
Py::List, Py::SeqBase<Py::Object>::iterator)':
./CXX/Objects.hxx:2271: error: 's' was not declared in this scope
./CXX/Extensions.hxx: In constructor
'Py::PythonExtension<T>::PythonExtension() [with T =
Py::ExtensionModuleBasePtr]':
CXX/cxx_extensions.cxx:91: instantiated from here
./CXX/Extensions.hxx:472: warning: right-hand operand of comma has no effect
error: command 'gcc' failed with exit status 1
make: *** [build-stamp] Error 1
Comando di costruzione 'cd python-matplotlib-0.61.0 && dpkg-buildpackage
-b -uc' fallito.
W: Impossibile controllare la lista dei pacchetti sorgente
http://www.steve.org.uk ./ Packages
(/var/lib/apt/lists/www.steve.org.uk_apt_._Packages) - stat (2 No such
file or directory)
W: Impossibile controllare la lista dei pacchetti sorgente
http://people.debian.org ./ Packages
(/var/lib/apt/lists/people.debian.org_%7ejsogo_beagle_._Packages) - stat
(2 No such file or directory)
W: � consigliabile eseguire apt-get update per correggere questi problemi
E: Processo figlio fallito