If you look in the AlexT repository http://repo.opkg.net/edison/repo/core2-32/, there you can find the libgdiplus package available. You´ll just need to configure your base-feeds.conf file to fetch packages from the repo (in case you haven’t already) or download it directly using the full link.
Thanks for your reply.
Let me try and see whether it works without any version conflicts with mono.
Meanwhile is it possible to add these .ipk packages directly to image?