This change:
ugorji/go@54210f4
Causes go-etcd to fail to compile, I've created a PR coreos/go-etcd#250. To work around for now you can add the following to patch go-etcd before compiling registrator.
go get -u github.com/ugorji/go/codec/codecgen
go get -u github.com/coreos/go-etcd/etcd
cd /go/src/github.com/coreos/go-etcd/etcd
/go/bin/codecgen -d 1978 -o response.generated.go response.go