pip install pytiff fails when numpy is not available

[ylep]

pip install pytiff
Downloading/unpacking pytiff
Downloading pytiff-0.7.0.tar.gz (1.3MB): 1.3MB downloaded
Running setup.py (path:/tmp/pip-build-3abmxk7b/pytiff/setup.py) egg_info for package pytiff
Traceback (most recent call last):
File "/tmp/pip-build-3abmxk7b/pytiff/setup.py", line 13, in
import numpy
ImportError: No module named 'numpy'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 17, in <module>
  File "/tmp/pip-build-3abmxk7b/pytiff/setup.py", line 15, in <module>
    raise Exception("Numpy is needed for installation")
Exception: Numpy is needed for installation
Complete output from command python setup.py egg_info:
Traceback (most recent call last):

File "/tmp/pip-build-3abmxk7b/pytiff/setup.py", line 13, in

import numpy

ImportError: No module named 'numpy'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

File "", line 17, in

File "/tmp/pip-build-3abmxk7b/pytiff/setup.py", line 15, in

raise Exception("Numpy is needed for installation")

Exception: Numpy is needed for installation

[pglock]

This is working as intended. Pytiff needs the numpy header files, so it must be already installed