As known as #335108. This is (was) a long term bug in Gentoo KDE scope. The problem is that if you have two or more different boost versions installed, the latest version will be used at build time, regardless which version is (e)selected. Real world example we have boost 1.46.1 and 1.47.0 installed selected the 1.46 slot, the 1.47 slot would be used at build:
$ eselect boost list Available boost versions:  boost-1.46/default *  boost-1.47/default
Last night i patched dev-util/cmake-2.8.6 successfully and made the revision bump today in the kde-overlay. So please test =dev-util/cmake-2.8.6-r5, in the case your maintained package is cmake based and needs dev-util/boost at build time. You should test at least with two different boost versions and of course switch between those to check that the selected version is used.
I bumped dev-util/cmake-2.8.7 in the overlay too. The patch is also included in this version.
Start your engines…