when i try to compile nvidia-drivers with gentoo-sources 2.6.20-r3 i get 
the following error:
">>> Compiling source in 
/var/tmp/portage/x11-drivers/nvidia-drivers-1.0.9755-r1/work/NVIDIA-Linux-x86_64-1.0-9755-pkg2/usr/src/nv 
...
 * Preparing nvidia module
rm -f Makefile
sh ./conftest.sh "x86_64-pc-linux-gnu-gcc" "x86_64-pc-linux-gnu-gcc" 
/usr/src/linux /usr/src/linux cc_sanity_check full_output
sh ./conftest.sh "x86_64-pc-linux-gnu-gcc" "x86_64-pc-linux-gnu-gcc" 
/usr/src/linux /usr/src/linux select_makefile full_output
make --no-print-directory -f Makefile module

NVIDIA: calling KBUILD...
make CC=x86_64-pc-linux-gnu-gcc  KBUILD_VERBOSE=1 -C /usr/src/linux 
M=/var/tmp/portage/x11-drivers/nvidia-drivers-1.0.9755-r1/work/NVIDIA-Linux-x86_64-1.0-9755-pkg2/usr/src/nv 
modules
make[2]: warning: jobserver unavailable: using -j1.  Add `+' to parent 
make rule.
test -e include/linux/autoconf.h -a -e include/config/auto.conf || 
(            \
        echo;                                                           \
        echo "  ERROR: Kernel configuration is invalid.";               \
        echo "         include/linux/autoconf.h or 
include/config/auto.conf are missing.";      \
        echo "         Run 'make oldconfig && make prepare' on kernel 
src to fix it.";  \
        echo;                                                           \
        /bin/false)
"

However i checked,and both include/linux/autoconf.h and 
include/config/auto.conf exist... :/

and in the end i get the following:
"--------------------------- ACCESS VIOLATION SUMMARY 
---------------------------
LOG FILE = 
"/var/log/sandbox/sandbox-x11-drivers_-_nvidia-drivers-1.0.9755-r1-13081.log"

open_wr:   /usr/src/linux-2.6.20-gentoo-r3/-.gcda
--------------------------------------------------------------------------------
"

what's wrong? :/

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