New issue 2739: Numpy install problem under PyPy 3.5 (Windows) https://bitbucket.org/pypy/pypy/issues/2739/numpy-install-problem-under-pypy... Ruud van der Ham: I am trying to install numpy under PyPy 3.5 on Windows with **pypy3 -m pip install cython numpy** Everything seems to install but the setup of numpy ends with an error message. FYI: I am using Windows 10.