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The theano installation documentation states, that theano will as a default use the BLAS libraries from numpy, if the "BLAS libraries are available as dynamically-loadable libraries". This seems not to be working on my machine, see error message. How do I find out, if the numpy BLAS libraries are availalbe as dynamically-loadable? How do I recompile the numpy BLAS libraries, if they are not dynamically-loadable? Please indicate, if you would need more information! Error message We did not found a dynamic library into the library_dir of the library we use for blas. If you use ATLAS, make sure to compile it with dynamics library. /usr/bin/ld: cannot find -lblas Appendix The theano library needs among other things numpy and a BLAS library. I figured numpy comes with BLAS if you install it with sudo apt-get install python-numpy python-scipy under Ubuntu. This is the filelisting of /usr/lib64/python2.6/dist-packages/scipy/lib/blas cblas.so info.py __init__.py scons_support.py setup.py fblas.so info.pyc __init__.pyc scons_support.pyc setup.pyc setupscons.py test setupscons.pyc This is the output of distutils.__config__.show() is as follows blas_info: libraries = ['blas'] library_dirs = ['/usr/lib64'] language = f77 lapack_info: libraries = ['lapack'] library_dirs = ['/usr/lib64'] language = f77 atlas_threads_in

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