make bench never finishes

[bertdouglas]

Using debian testing. Just cloned erlzmq2.
I started "make bench". Left it overnight, about 15 hours. It did not finish.
I interrupted with control-c. Got following output:

bertd@beam-dev:~/erlzmq2$ make bench
==> erlzmq2 (compile)
make[1]: Entering directory /home/bertd/erlzmq2/c_src' make[1]: Nothing to be done forall'.
make[1]: Leaving directory `/home/bertd/erlzmq2/c_src'
Running benchmarks, this could take some time...
^CTraceback (most recent call last):
File "./perf/perfgraphs.py", line 89, in
TestRun(100, 1, 100000).plot_thr()
File "./perf/perfgraphs.py", line 56, in plot_thr
self.msgcount, True)
File "./perf/perfgraphs.py", line 20, in thr_run
out = do_test(localcmd, remotecmd)[0]
File "./perf/perfgraphs.py", line 9, in do_test
local.wait()
File "/usr/lib/python2.7/subprocess.py", line 1291, in wait
pid, sts = _eintr_retry_call(os.waitpid, self.pid, 0)
File "/usr/lib/python2.7/subprocess.py", line 478, in _eintr_retry_call
return func(args)
KeyboardInterrupt
make: ** [bench] Error 1