On Tue, 7 Mar 2017 15:07:32 +0000, White, Phil wrote:

> I have a new install of Gentoo.
> emerge -uDpv --newuse @system results in a new slot for gcc,
> *downgrading* the current version (from 5.4.0 to 4.9.4)
> No other package is selected for merging.

4.9.4 is the latest stable. Are you running a stable system with some
packages in package.accept_keywords? If so, and you gave a specific
version of gcc, it is possible that version is no longer in the tree -
5.4.0-r2 was recently removed.

Use the ~ operator when specifying versions to allow for minor updates

~sys-devel/gcc-5.4.0

or, in the case of gcc, you can specify a slot

sys-devel/gcc:5.4.0


-- 
Neil Bothwick

Despite the cost of living it remains popular.

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