Version 21e is available upstream. Please consider updating!
It seems that version 21e is available upstream, while the latest version in the Gentoo tree is 21c.
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Available Versions

Versionamd64x86alphaarmarm64hppaia64ppcppc64riscvsparc
21c  : 0 -amd64 x86 -alpha -arm -arm64 -hppa -ia64 -ppc -ppc64 -riscv -sparc

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