To invoke the utility automatically during kernel configuration via this script, set this option to 'yes' here; otherwise, choose 'no'.CLEAN=[yes|no]: Setting this option to 'yes' is equivalent to the --clean flag used by genkernel, and invokes the make clean command to remove all object files and dependencies from thekernel's source tree. -最近のgenkernelは、/etc/genkernel.conf内のMOUNTBOOTを"yes"に設定すれば、自動でそれを試みます。 - Gentoo Linux
MENUCONFIG=[yes|no]: This option is equivalent to the --menuconfig flag used by genkernel, which in turn uses the make menuconfig command to invoke a command-line based kernel configuration utility. もし、あなたが同様にカーネルのインストールのためにgenkernelを欲するのであれば、確実に/bootパーティションをマウントしてください。 - Gentoo Linux