Masking packages depending on the overlay [Solved]

[aCOSwt]

I fail to find this possibility with package.mask

What is the smartest solution to mask a package from a particular overlay (including the local one)

For example, I get an ebuild package_name-Version_X in Gentoo portage and another ebuild with the same name in an overlay. (Of course these two ebuilds are different )

How can I instruct portage to ignore the one from the overlay but take portage's one into consideration ?
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[skunk]

echo "package::overlay" >> /etc/portage/package.mask

[aCOSwt]

Fits perfectly for purpose.

Thanks a lot, skunk.
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