I have an apple computer running Leopard with python 2.6. I downloaded the latest version of scapy and ran \"python setup.py install\". All went according to plan
python setup.py install
Install libdnet:http://libdnet.sourceforge.net/ and python-libpcat: http://sourceforge.net/projects/pylibpcap/
For libdent:
CFLAGS='-arch i386 -arch x86_64' ./configure --prefix=/usr archargs='-arch i386 -arch x86_64' make sudo make install cd python sudo python setup.py install