I installed dev-libs/boost-1.60.0 with USE="-context" but the context lib was built anyway and the following .so got installed: /usr/lib64/libboost_context.so.1.60.0. When USE="-context" is set boost is configured with --without-context --without-coroutine. But a new library Coroutine2 was added in Boost 1.49 which depends on Context, too. This library has to be disabled with --without-coroutine2. The headers of all three libs (context, coroutine and coroutine2) are not installed.
I haven't revbumped the ebuild, as the changes likely won't affect anyone (consuming boost_context is hardly possible without the headers anyway) and triggering a rebuild for such a small change is likely going to leave a measurable carbon footprint on the atmosphere. If you want the changes, just re-emerge it by hand. commit c1411c2d7a83416a4e875b96f90847371bab500e Author: David Seifert <soap@gentoo.org> Date: Sat Apr 9 12:25:17 2016 +0200 dev-libs/boost: Add --without-coroutine2 when USE="-context" Gentoo-Bug: 579008
