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:orphan:
.. _building:
Building from sources
=====================
.. note::
If you are only trying to install SciPy, see
:doc:`../install_upgrade`.
Build instructions for different operating systems and an FAQ:
.. toctree::
:maxdepth: 2
linux
windows
macosx
faq
Reference for build options
===========================
Scipy has several tunable build-time options, which can be set.
- ``site.cfg``: build-time library configuration file, see
``site.cfg.example`` for details.
- Environment variables ``NPY_LAPACK_ORDER``, ``NPY_BLAS_ORDER``, ``OPENBLAS``,
``ATLAS``, etc., also controlling library configuration.
See `Numpy documentation <numpy-blasdoc>`_ for more details.
- Environment variable ``NPY_USE_BLAS_ILP64=1``: build using 64-bit
integer size (ILP64) BLAS+LAPACK libraries.
Note that even when this is set, Scipy requires *also* 32-bit
integer size (LP64) BLAS+LAPACK libraries to be available and
configured. This is because only some components in Scipy make use
of the 64-bit capabilities.
.. _numpy-blasdoc: https://numpy.org/devdocs/user/building.html#accelerated-blas-lapack-libraries
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