Translations:Handbook:Parts/Installation/Kernel/239/en
From Gentoo Wiki
The use of sys-kernel/installkernel is not strictly required, but highly recommended. When this package is installed, the kernel installation process will be delegated to installkernel. This allows for installing several different kernel versions side-by-side as well as managing and automating several tasks relating to kernel installation described later in the handbook. Install it now with:
root #emerge --ask sys-kernel/installkernel