The rkt package doesn't build:

GO github.com/coreos/rkt/stage1_fly/enter
UNSQUASHFS build-rkt-1.25.0/tmp/coreos-common/usr.squashfs => build-rkt-1.25.0/tmp/usr_from_kvm/cbu/rootfs/usr
UNSQUASHFS build-rkt-1.25.0/tmp/coreos-common/usr.squashfs => build-rkt-1.25.0/tmp/usr_from_coreos/cbu/rootfs/usr

write_xattr: could not write xattr security.selinux for file /build/rkt/src/rkt-1.25.0/build-rkt-1.25.0/tmp/usr_from_kvm/cbu/rootfs/usr/lib because you're not superuser!

write_xattr: to avoid this error message, either specify -user-xattrs, -no-xattrs, or run as superuser!

Further error messages of this type are suppressed!

write_xattr: could not write xattr security.selinux for file /build/rkt/src/rkt-1.25.0/build-rkt-1.25.0/tmp/usr_from_coreos/cbu/rootfs/usr/lib because you're not superuser!

write_xattr: to avoid this error message, either specify -user-xattrs, -no-xattrs, or run as superuser!

Further error messages of this type are suppressed!
ACTOOL build-rkt-1.25.0/target/bin/stage1-fly.aci
ACTOOL build-rkt-1.25.0/target/bin/stage1-host.aci
BUILD EXT bzImage
ACTOOL build-rkt-1.25.0/target/bin/stage1-coreos.aci

/build/rkt/src/rkt-1.25.0/build-rkt-1.25.0/tmp/usr_from_kvm/kernel/linux-4.9.2/scripts/mkcompile_h: line 51: hostname: command not found
GIT CLEAN build-rkt-1.25.0/tmp/usr_from_kvm/lkvm/src
GIT DESCRIBE https://kernel.googlesource.com/pub/scm/linux/kernel/git/will/kvmtool (cfae4d64482ed745214e3c62dd84b79c2ae0f325) => cfae4d6
BUILD EXT lkvm
Makefile:315: Skipping optional libraries: bfd GTK3 vncserver SDL aio
KVMTOOLS_VERSION = 3.18.0
Makefile:315: Skipping optional libraries: bfd GTK3 vncserver SDL aio
virtio/9p.c: In function ‘virtio_p9_mknod’:
virtio/9p.c:968:13: error: In the GNU C Library, "makedev" is defined
by <sys/sysmacros.h>. For historical compatibility, it is
currently defined by <sys/types.h> as well, but we plan to
remove this soon. To use "makedev", include <sys/sysmacros.h>
directly. If you did not intend to use a system-defined macro
"makedev", you should undefine it after including <sys/types.h>. [-Werror]
ret = mknod(full_path, mode, makedev(major, minor));
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make[1]: *** [Makefile:423: virtio/9p.static.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make: *** [stage1/usr_from_kvm/lkvm.mk:30: /build/rkt/src/rkt-1.25.0/build-rkt-1.25.0/stamps/__stage1_usr_from_kvm_lkvm_mk_build.stamp] Error 2
make: *** Waiting for unfinished jobs....