Debian binary package

Users of Debian and Debian-based distros can dowload i386 and amd64 .deb packages from

Graphical tools exist that automatically install a package and all its dependencies.

If you prefer to use a command-line tool, after downloading the file execute this as root in the directory where you dowloaded the installer:
dpkg -i opeke_0.3.1-1_i386.deb
Replace i386 with amd64 if you have a 64-bit system.