!!! existing preserved libs:
>>> package: sys-libs/binutils-libs-2.27
 *  - /usr/lib64/libbfd-2.25.1.so
 *      used by /usr/lib64/binutils/x86_64-pc-linux-gnu/2.25.1/libopcodes-2.25.1.so (sys-devel/binutils-2.25.1-r1)
Use emerge @preserved-rebuild to rebuild packages using these libraries