A good place to start is to make a hotlist of anything that isn't owned by a package.
You really shouldn't randomly delete things that portage thinks belongs to someone.
But if you find orphaned junk, it could be fair game. If you have something bulky that DOES belong to a package, consider using emerge --unmerge on it if you don't need it.
On Thu, Oct 1, 2015 at 1:15 PM, Nikos Chantziaras <realnc@gmail.com> wrote:
On 01/10/15 23:14, Nikos Chantziaras wrote:
ncdu also makes it easier to find where the space is consumed. "ncdu /"
will scan and sort by size.