Just for closure ... I managed to get lxdoom to work on a clean install of os2006 as well as 2007HE using the bora repositories suggested by nosam. I'm not sure it the libshadow problems were created by trying to load an incorrect version of lxdoom or some other configurations I had done earlier. I've not the time nor patience to test what went wrong in a scientific method, but I would recommend a clean flash of the OS and using the repositories described above - especially if there is a libshadow error when starting the game from xterm.

Thnx nosam