Restrict to python 3.x due to failure building under 2.7:
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "setup.py", line 50
raise ImportError("numpy is required at installation") from e
^
SyntaxError: invalid syntaxNothing depends on the py27 flavor.
Approved by: portmgr ("just fix it")