That is a source package:
7.13 How do I install a source package?
Debian source packages can't actually be "installed", they are just unpacked in whatever directory you want to build the binary packages they produce.
Source packages are distributed on most of the same mirrors where you can obtain the binary packages. If you set up your APT's sources.list(5) to include the appropriate "deb-src" lines, you'll be able to easily download any source packages by running
apt-get source foo
To help you in actually building the source package, Debian source package provide the so-called build-dependencies mechanism. This means that the source package maintainer keeps a list of other packages that are required to build their package. To see how this is useful, run
apt-get build-dep foo
before building the source.
So you can't actually "install" it. However, there are binary packages
built from it:
One of them should contain what you want.