Obfs4proxy commit cdeda5724124ca393c87be6d01c84fe4f906d612 breaks nightly builds
+ cd obfs4proxy
+ go build -ldflags -s
../../../go/src/git.torproject.org/pluggable-transports/obfs4.git/common/ntor/ntor.go:46:2: cannot find package "golang.org/x/crypto/curve25519" in any of:
/home/ubuntu/build/go/src/pkg/golang.org/x/crypto/curve25519 (from $GOROOT)
/home/ubuntu/go/src/golang.org/x/crypto/curve25519 (from $GOPATH)
../../../go/src/git.torproject.org/pluggable-transports/obfs4.git/common/ntor/ntor.go:47:2: cannot find package "golang.org/x/crypto/hkdf" in any of:
/home/ubuntu/build/go/src/pkg/golang.org/x/crypto/hkdf (from $GOROOT)
/home/ubuntu/go/src/golang.org/x/crypto/hkdf (from $GOPATH)
../../../go/src/git.torproject.org/pluggable-transports/obfs4.git/transports/obfs4/framing/framing.go:70:2: cannot find package "golang.org/x/crypto/nacl/secretbox" in any of:
/home/ubuntu/build/go/src/pkg/golang.org/x/crypto/nacl/secretbox (from $GOROOT)
/home/ubuntu/go/src/golang.org/x/crypto/nacl/secretbox (from $GOPATH)