This will create main dir tree for installation with svn support etc etc

svn checkout pyrit_svn
We have just created a dir /pyrit_svn
This will install libs and other stuff needed:

apt-get install libssl-dev
apt-get install scapy
apt-get install python-dev
Going to build pyrit

cd pyrit_svn/pyrit
python build
python install
Check now if works typing pyrit on a command line.