If using git (not the tarball), build the "configure" file: autoreconf --install
To then build from source: ./configure make
For detailed installation directions, see the guide
at doc/guide/kea-guide.txt or doc/guide/kea-guide.html.
You can find user-contributed OS-specific build/installation
instructions on the Kea wiki: http://kea.isc.org/wiki/SystemSpecificNotes