Handbook:AMD64/Blocks/Kernel

Architecture specific kernel configuration
Make sure to select IA32 Emulation if 32-bit programs should be supported (multilib). Gentoo will install a multilib system (mixed 32-bit/64-bit computing) by default, so unless a profile is used, this option is required.

Enable GPT partition label support if that was used previously when partitioning the disk:

Enable EFI stub support and EFI variables in the Linux kernel if UEFI is used to boot the system:

Compiling and installing
With the configuration now done, it is time to compile and install the kernel. Exit the configuration and start the compilation process:

When the kernel has finished compiling, copy the kernel image to. This is handled by the command:

This will copy the kernel image into together with the  file and the kernel configuration file.

With UEFI systems, create the location, and then copy the kernel into this location, calling it :