Degate uses OpenGL for rendering. Under OS X hardware accelerated OpenGL rendering should work out of the box. Under Linux it requires that you have installed some drivers. What must be done for that highly depends on your graphics cards. This topic is not covered here. The default is software rendering (MESA). On current computers that is probably fast enough.
You need cmake ≥2.6 in order to generate the makefiles, else you will get an error message like Unknown CMake command "FIND_PACKAGE_HANDLE_STANDARD_ARGS" and the cmake version check may fail, too.
On a freshly installed Ubuntu it should be sufficient to install these packages:
> sudo apt-get install cmake libboost-filesystem-dev \ libboost-system-dev libboost-thread-dev \ libboost-program-options-dev \ libcppunit-dev \ doxygen g++ gdb libgtkmm-2.4-dev libglademm-2.4-dev libxml++2.6-dev \ libfreetype6-dev libzip-dev libgtkglextmm-x11-1.2-dev \ libxmlrpc-c++8-dev libtiff-dev libpng-dev libcurl4-gnutls-dev
> sudo port install gtkmm cmake boost cppunit doxygen freetype \ libglademm libxmlxx2 libzip xmlrpc-c gtkglextmm gnome-icon-theme
Get sources for degate from download section and extract it. Go into the main directory and type:
> cmake . && make