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/usr/src/linux-<version>-gentoo
make menuconfig
to configure your kernelmake -j$TC && make -j$TC moddules_install && make install
(where $TC
is the thread count, i.e. the number of cores in your CPU+1)grub-mkconfig -o /boot/grub/grub.cfg
genkernel initramfs
to update your initramfs