We need to have USE=static-libs because this package install '.a' files: /usr/lib/libdw.so.1 /usr/lib/libasm.so /usr/lib/libasm-0.149.so /usr/lib/libasm.so.1 /usr/lib/libelf.so /usr/lib/libelf.so.1 /usr/lib/libebl.a /usr/lib/libdw-0.149.so /usr/lib/libasm.a /usr/lib/libdw.a /usr/lib/libelf.a /usr/lib/libdw.so
it's already implemented $ emerge elfutils -pvq [ebuild R ] dev-libs/elfutils-0.155 USE="bzip2 lzma nls static-libs threads utils zlib {-test}"