You can find the source code here:

Now here's a *very* brief installation guide to build kaid in Ubuntu (also Debian based):

  1. Download and extract the tar.gz file mentioned above
  2. Goto main extraction directory, path to extracted file ends with kaid-
  3. sudo apt-get install g++
  4. cd pthreadcc
  5. make
  6. sudo make install
  7. cd ../libpcap
  8. Use Synaptic Package Manager to install the flex package
  9. Use Synaptic Package Manager to install bison package
  10. ./configure
  11. make
  12. sudo make install
  13. cd ../socketcc
  14. make
  15. sudo make install
  16. cd ..
  17. make (kaid executable is now created)
  18. sudo cp kaid.conf /etc/.
  19. sudo ./kaid
  20. Always trust content from this publisher
  21. Specify XTag and password
  22. Save
  23. Connect to Engine (button)
  24. Switch to Arena mode and back to see users in Messenger Mode