i still have few problem :
- when starting pd in the Gem/ folder, it start correctlly.
 when starting pd in an other folder, pd segfault when loading gem_videoVLC plugin
so, i just remove it : sudo rm /usr/local/lib/pd/extra/Gem/gem_videoVLC.*

- i did not try all example, but most work. i do however have some problem with Gem/examples/10.glsl/05.multitexture_bis.pd
        if i open and close this patch, pd segfault (even without opening a rendering window). The patch did work.