emerge fails with 'there are no ebuilds to satisfy "sys-devel/autoconf".'

(gentoo-110) 2024-01-25 20:15:30 vozhx-x1 /home/vozhyk # emerge -avt genkernel

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These are the packages that would be merged, in reverse order:

Calculating dependencies... done!
Dependency resolution took 14.64 s (backtrack: 2/20).


emerge: there are no ebuilds to satisfy "sys-devel/autoconf".
(dependency required by "sys-kernel/genkernel-9999::linux-be" [ebuild])
(dependency required by "genkernel" [argument])