well, i did update wesnoth and wesnoth-data, it seems to work fine now

For people that are not aware, you can get it from extra-devel. It's totally optified and will take around 300Mb on the "opt" partition (home partition). If space is needed ( and for better in-game speed, because some textures seems slow to load from eMMC ) you can move the folder "/opt/maemo/usr/share/wesnoth" to an microSD card, then symlink it from the microSD to "/opt/maemo/usr/share/wesnoth".

Else, all seems to work well, i just disabled the editor. Maybe i should make my own thread ?

gibrovacco : just remove the "-O2" flag and your problem will be solved