Voila se que j'optiens, j'ai recompilé le kernel avec tout les trucs i2c mais ca n'a rien donné 
gentoo em8300-libraries # emerge em8300-libraries-0.13.0.ebuild
Calculating dependencies ...done!
>>> emerge (1 of 2) media-video/em8300-modules-0.13.0 to /
>>> md5 src_uri ;-) em8300-0.13.0.tar.gz
>>> Unpacking source...
>>> Unpacking em8300-0.13.0.tar.gz to /var/tmp/portage/em8300-modules-0.13.0/work
>>> Source unpacked.
rm -f *.o
gcc -D__KERNEL__ -DMODULE -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -g -I ../include -I /lib/modules/2.4.22-gentoo-test-r0/build/include/ -O2 -fomit-frame-pointer -Wall -DEM8300_VIDEOMODE_DEFAULT=EM8300_VIDEOMODE_NTSC -DEM8300_AUDIOMODE_DEFAULT=EM8300_AUDIOMODE_ANALOG -DEM8300_VERSION=\""0.13.0"\" -DCONFIG_ADV717X_PIXELPORT16BIT -DCONFIG_ADV717X_PIXELPORTNTSC -DCONFIG_EM8300_DICOMNTSC -DCONFIG_EM8300_DICOMFIX -DCONFIG_EM8300_DICOMCTRL -DMODVERSIONS -include /lib/modules/2.4.22-gentoo-test-r0/build/include/linux/modversions.h -c -o em8300_main.o em8300_main.c
In file included from em8300_main.c:57:
/lib/modules/2.4.22-gentoo-test-r0/build/include/linux/i2c-algo-bit.h:51: warning: `struct i2c_adapter' declared inside parameter list
/lib/modules/2.4.22-gentoo-test-r0/build/include/linux/i2c-algo-bit.h:51: warning: its scope is only this definition or declaration, which is probably not what you want
/lib/modules/2.4.22-gentoo-test-r0/build/include/linux/i2c-algo-bit.h:52: warning: `struct i2c_adapter' declared inside parameter list
In file included from encoder.h:4,
from em8300_main.c:59:
../include/linux/em8300.h:276: field `i2c_ops_1' has incomplete type
../include/linux/em8300.h:280: field `i2c_ops_2' has incomplete type
../include/linux/em8300.h:361: confused by earlier errors, bailing out
make: *** [em8300_main.o] Error 1
!!! ERROR: media-video/em8300-modules-0.13.0 failed.
!!! Function src_compile, Line 42, Exitcode 2
!!! (no error message)
