QEMU 2.6 was released on May 11th, 2016. Please update the Gentoo package for the new version.
now in the tree; thanks for the heads up https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=a4dcaf13597f5603786f423f7af2d927ce640c53 https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=0fcf5a85374133de8480e25efcd9fa70da4b06f6