Net benchmarks fail to build

Version: v7.0.0-pre (@master)
Platform: OS X 10.11.4
Subsystem: Benchmark

Running make bench results in the output:

net/net-c2s-cork.js
_stream_readable.js:19
    return emitter.prependListener(event, fn);
                   ^

TypeError: emitter.prependListener is not a function
    at prependListener (_stream_readable.js:19:20)
    at Socket.Readable.pipe (_stream_readable.js:582:3)
    at Server.<anonymous> (<node_dir>/benchmark/net/net-c2s-cork.js:71:12)
    at emitOne (events.js:96:13)
    at Server.emit (events.js:188:7)
    at TCP.onconnection (net.js:1452:8)
child process exited with code 1