[gentoo-user] How can I unmask package and mask just its one version?

[Jarry]

Hi,
how can I unmask (generally) certain M~ masked package and
mask one particular version of that package? I want to use
that package, but skip just one "x.y.z" upgrade, and continue
with any future higher upgrades ("x.y.z+1").

So I entered tree/package in /etc/portage/package.unmask, and
tree/package_x.y.z into /etc/portage/package.mask. But this
does not work, that "x.y.z" version still wants to be installed...

Jarry

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