According to what I found, I will have to install the uvcvideo package.

So I downloaded the file from http://linux-uvc.berlios.de/ and I tried to compile it myself.

Thanks to busybox, I obtained an error at the very beginning :

the version of ln given by busybox does not understand the parametre --target-directory, As it was used this way :

--target-directory=.

I though it was a bit useless and i deleted It.

Be there was an other error which is show hereafter :

make -C /root/uvcvideo-75c97b2d1a2a/v4l
make[1]: entrant dans le r�pertoire � /root/uvcvideo-75c97b2d1a2a/v4l �
creating symbolic links...
make -C firmware prep
make[2]: Entering directory `/root/uvcvideo-75c97b2d1a2a/v4l/firmware'
make[2]: Leaving directory `/root/uvcvideo-75c97b2d1a2a/v4l/firmware'
make -C firmware
make[2]: Entering directory `/root/uvcvideo-75c97b2d1a2a/v4l/firmware'
make[2]: Nothing to be done for `default'.
make[2]: Leaving directory `/root/uvcvideo-75c97b2d1a2a/v4l/firmware'
Kernel build directory is /lib/modules/2.6.25.5-slitaz/build
make -C /lib/modules/2.6.25.5-slitaz/build SUBDIRS=/root/uvcvideo-75c97b2d1a2a/v4l modules
make[2]: Entering directory `/usr/src/linux-2.6.25.5-slitaz'
make[3]: *** No rule to make target `/root/uvcvideo-75c97b2d1a2a/v4l/cpia2_v4l.o', needed by `/root/uvcvideo-75c97b2d1a2a/v4l/ir-core.o'. Stop.
make[2]: *** [_module_/root/uvcvideo-75c97b2d1a2a/v4l] Error 2
make[2]: Leaving directory `/usr/src/linux-2.6.25.5-slitaz'
make[1]: *** [default] Erreur 2
make[1]: quittant le r�pertoire � /root/uvcvideo-75c97b2d1a2a/v4l �
make: *** [all] Erreur 2

Thanks lot for Help