Tell pip and other tools that Numpy is required before build.
MAINT: add install_requires to setup.py
-1, see http://article.gmane.org/gmane.comp.python.numeric.general/51758
@rgommers: I thought there was some reason why it wasn't there, hence via PR... So the reason is that -U in easy_install and pip also causes upgrade of Numpy which can break stuff? Pip seems to have been fixed: pypa/pip#571 EDIT: or, actually not.
Correct. And indeed, that pip PR is not in. sadly....