Thank you very much to all of you for helping me,
First I'm really really sorry, I probably misleaded you. The glx extensions and the Speedo font problems were caused by something else.....I forgot to do a modprobe NVdriver (I know it's fuc$^% stupid!)
I'm using LFS 4.0 but I used gcc 2.95.3 to compile everything including the drivers.(I had too much trouble with gcc 3.2 for many things such as compiling uClibc apps)
I've posted another topic to explain my x crash problem in greater details cause I've done more tests and I've attached the XFree86.0.log and the .xsession-errors hopping it can help.
Thank you again for taking the time to help me!