After unmerging sys-process/numactl I noticed that =app-emulation/xen-tools-4.8.0 has automatic on that package: > !!! existing preserved libs: > >>> package: sys-process/numactl-2.0.11-r1 > * - /usr/lib64/libnuma.so.1 > * - /usr/lib64/libnuma.so.1.0.0 > * used by /usr/libexec/xen/bin/qemu-system-i386 (app-emulation/xen-tools-4.8.0)