Version 3.13.1 is available upstream. Please consider updating!
It seems that version 3.13.1 is available upstream, while the latest version in the Gentoo tree is 3.13.0. You think this warning is false? Read more about it here.
Intel® Embree is a collection of high-performance ray tracing kernels,
developed at Intel. The target users of Intel® Embree are graphics
application engineers who want to improve the performance of their
photo-realistic rendering application by leveraging Embree's
performance-optimized ray tracing kernels.