The instructions assume that Debian was installed with all defaults, including the graphical Desktop.
Run Desktop - Administration - Synaptic Package Manager.
Install the following packages:
g++ libgtk2.0-dev libsqlite3-dev libxml2-dev git-core libenchant-dev libgtkhtml3.14-dev libcurl4-openssl-dev rcs libgtksourceview2.0-dev libwebkit-dev libdbus-glib-1-dev chmsee
Apply the changes.
The installer will update the system.
Close the window when through.
Open a terminal by clicking Applications, Accessories, Terminal.