emerge with stable portage gets this
The following keyword changes are necessary to proceed:
#required by dev-python/cvxopt-1.1.4-r1[dsdp], required by sci-mathematics/sage-4.8, required by sci-mathematics/sage-notebook-0.8.26
#required by sci-mathematics/sage-4.8, required by sci-mathematics/sage-notebook-0.8.26
I think sage.keywords should be upgrade.
Also zope is be hard masked and will be removed in recent. What is the way to install sage now?
Update keywords/use file (issue #120)
Add net-zope/ packages (issue #120)
Thanks for your report! Zope is now in our local overlay and unmasked (only there).