build.sh

#!/bin/bash
set -e
set -x

RUNC_GOPATH="$(mktemp -d)"
CONTAINERD_GOPATH="$(mktemp -d)"
PWD="$(pwd)"

function cleanup() {
        rm -rf "${RUNC_GOPATH}"
        rm -rf "${CONTAINERD_GOPATH}"
        cd "${PWD}"
}

trap cleanup EXIT

dockerfile_path="${GOPATH}/src/github.com/docker/docker/Dockerfile"
RUNC_COMMIT=$(grep RUNC_COMMIT $dockerfile_path | head -n 1 | cut -d" " -f 3)
echo $RUNC_COMMIT

CONTAINERD_COMMIT=$(grep CONTAINERD_COMMIT $dockerfile_path | head -n 1 | cut -d" " -f 3)
echo $CONTAINERD_COMMIT

echo "Building runc"
GOPATH=$RUNC_GOPATH
git clone git://github.com/opencontainers/runc.git "$GOPATH/src/github.com/opencontainers/runc"
pushd "$GOPATH/src/github.com/opencontainers/runc"
git checkout -q "$RUNC_COMMIT"
make BUILDTAGS="seccomp selinux"
cp runc /usr/local/bin/docker-runc
popd

echo "Building containerd"
GOPATH=$CONTAINERD_GOPATH
git clone git://github.com/docker/containerd.git "$GOPATH/src/github.com/docker/containerd"
pushd "$GOPATH/src/github.com/docker/containerd"
git checkout -q "$CONTAINERD_COMMIT"
make 
cp bin/containerd /usr/local/bin/docker-containerd
cp bin/containerd-shim /usr/local/bin/docker-containerd-shim
cp bin/ctr /usr/local/bin/docker-containerd-ctr
popd

@runcom I have updated it with improvements. It doesn't clobber the global GOPATH. It ensures cleanup of the tmp build directories and returns you to the directory from where the script was executed. Please try it out! :)