Default packages flags

[Pavel Baculák <baculak.pavel@post.cz>]

Please,
Is possible to know, which is default flags for packages? Or where can
i find this information? For example in Gentoo or in Sabayon is this
very easy. For Sabayon can I find all flags on the Sabayon's web page
for all packages.

Thank.

Best regards.

Baci