After today's update I have run into this: !!! existing preserved libs: >>> package: media-libs/libdisplay-info-0.2.0-r1 * - /usr/lib64/libdisplay-info.so.0.1.1 * - /usr/lib64/libdisplay-info.so.1 * used by /usr/lib64/libaquamarine.so.0.5.1 (gui-libs/aquamarine-0.5.1) Use emerge @preserved-rebuild to rebuild packages using these libraries Adding a slot operator to libdisplay-info would save users doing another emerge. As it is not an urgent matter I do not open a PR but just open a bug
It means you have a broken binpkg if it's built against the old but installing on a system w/o it.