Gentoo's Bugzilla –
Attachment 547344 Details for
Bug 666560sys-libs/glibc and sys-libs/musl fails to emerge from within a qemu-chroot (target: armv6/7 | host: x86_64) with: libsandbox/trace.c:_do_ptrace():75: failure (Function not implemented):* ISE:_do_ptrace: ptrace(PTRACE_TRACEME, ..., 0x00000000, 0x00000000)