scikit-learn install failure / numpy not found / missing numpy headers

Question

When i try to install scikit-learn on a Suse (openSuse 12.2 x86_64) server via:

pip install -U scikit-learn

i get the following error:

(....)

compile options: '-I/usr/lib64/python2.7/site-packages/numpy/core/include -Isklearn/svm/src/libsvm -I/usr/lib64/python2.7/site-packages/numpy/core/include -I/usr/include/python2.7 -c'

gcc: sklearn/svm/libsvm.c

sklearn/svm/libsvm.c:303:31: fatal error: numpy/arrayobject.h: No such file or directory

compilation terminated.

sklearn/svm/libsvm.c:303:31: fatal error: numpy/arrayobject.h: No such file or directory

compilation terminated.

I already tried:

-installing gcc to the latest version
-installing scikit from a downloaded zip, over easy_install (to avoid old repos) -uninstalling and reinstalling numpy (over pip)

When i try to install scipy (which is a requirement of numpy) i get a similar Error:

adding 'build/src.linux-x86_64-2.7/fortranobject.c' to sources.

adding 'build/src.linux-x86_64-2.7' to include_dirs.

error: file '/usr/lib64/python2.7/site-packages/numpy/f2py/src/fortranobject.c' does not exist

Apparently all the numpy headers in "site-packages/numpy/core/include" are missing. I already reinstalled numpy with pip without any Problems but the headers are still missing.

Answer 1

Ok when i installed numpy with pip or normally all the include header were missing.

To fix this i installed the package "python-numpy-devel" (with zypper, stupid suse package names...) which contains the headers.

After that the headers are there and the rest works.