Thanks, please check the git-hub issue.
> I had problems to build the version 1.0.1-r1 in gentoo with linux-3.0.0-rcX.
> As chromium, the matplotlib need fix the use of 'linux2' label. See chromium
> Is very simple fix. If you want, i can send one patch.
Thank you. I've filed an issue at github and identified it as needing
to be fixed in the next release. If you could submit a patch, that
would be helpful.