Trying to installing gentoo-sources, make oldconfig && make bzImage modules modules_install install, reboot and then trying to build nvidia-drivers fails with the following error when building on arch 32: nvidia error: code model `kernel' not supported in the 32 bit mode To fix, I did: # cd /usr/src/linux # mv .config ../ # make mrproper # mv ../.config ./ And then the usual: # make bzImage modules modules_install install (reboot if needed) # emerge nvidia-drivers Everything appears to build just fine now without error. I've seen this error/bug occur over the past two to four kernel upgrades. Reproducible: Always As I type this, I realize this might be either an upstream bug with the kernel source tarballs? Or are files/ patches dirtying the /usr/src/linux folder up with 64 bit configurations files? (I'll try to rule-out some of these scenarios on my 32 bit laptop when upgrading the kernel tonight/tomorrow.)