I did this "OE enigma_demo plugin how-to" for another board recently.
I post it here for anybody interested.
Instructions in the Readme file.
Regards, pcd.
ps.
As requested by the peppi (see below) here is a simple method for making plugins in a cdk build :-
Find the folder /apps/tuxbox/plugins/enigma/movieplayer. Copy and paste it back and rename it with your plugin name.
Put the attached file mymake (delete .txt) in that folder. Also put in your plugin source files. Edit mymake and the Makefile.am with the new file names and the path.
At the console - cd to this folder and do the command :-
./mymake
The plugin .so file will be in a hidden folder .libs as so.0.0.0.
pcd.