Getting dhvani
You can either install dhvani using the binaries or build from the source code.
Binaries
Prepackaged binaries for Debian based and Fedora based systems are available from here
In debian based systems install the deb package using
dpkg -i dhvani-[version].deb
In debian based systems install the deb package using
rpm -ivH dhvani-[version].rpm
Packages required for installing
Dhvani depends on ALSA for sound playback. Alsa libraries are required for playing speech. Since ALSA is usually used for sound in distros, it should be already installed in your system. Installer will complain if any of the required package dependency is not met. Dhvani uses soundtouch libraries for pitch and tempo modification. For ogg vorbis speech encoding it requires libvorbisec libraries.
Building from Sourcecode
You may build dhvani from the source code too. See chapter on compilation for more details