Comment 3 for bug 780565

I've made it work by compiling the source code with:

cd
wget http://wwwmaster.postgresql.org/download/mirrors-ftp/pgadmin3/release/v1.12.3/src/pgadmin3-1.12.3.tar.gz
sudo apt-get install postgresql-server-dev-8.4
sudo apt-get install libwxgtk2.8-dev
sudo apt-get install libxml2-dev
sudo apt-get install libxslt1-dev
./configure
make
~/pgadmin3-1.12.3/pgadmin/pgadmin3 &

I hope you find it useful
Marcos.