OpenBLAS

# OpenBLAS

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## Introduction

OpenBLAS is an optimized BLAS (Basic Linear Algebra Subprograms) library based on GotoBLAS2 1.13 BSD version.

For more information about OpenBLAS, please see:

- The documentation at [openmathlib.org/OpenBLAS/docs/](http://www.openmathlib.org/OpenBLAS/docs),
- The home page at [openmathlib.org/OpenBLAS/](http://www.openmathlib.org/OpenBLAS).

For a general introduction to the BLAS routines, please refer to the extensive documentation of their reference implementation hosted at netlib:
<https://www.netlib.org/blas>. On that site you will likewise find documentation for the reference implementation of the higher-level library LAPACK - the **L**inear **A**lgebra **Pack**age that comes included with OpenBLAS. If you are looking for a general primer or refresher on Linear Algebra, the set of six
20-minute lecture videos by Prof. Gilbert Strang on either MIT OpenCourseWare [here](https://ocw.mit.edu/resources/res-18-010-a-2020-vision-of-linear-algebra-spring-2020/) or YouTube [here](https://www.youtube.com/playlist?list=PLUl4u3cNGP61iQEFiWLE21EJCxwmWvvek) may be helpful.

## Binary Packages

We provide official binary packages for the following platform:

  * Windows x86/x86_64
  * Windows arm64 (woa)

You can download them from [file hosting on sourceforge.net](https://sourceforge.net/projects/openblas/files/) or from the [Releases section of the GitHub project page](https://github.com/OpenMathLib/OpenBLAS/releases).

OpenBLAS is also packaged for many package managers - see [the installation section of the docs](http://www.openmathlib.org/OpenBLAS/docs/install/) for details.

## Installation from Source

Obtain the source code from https://github.com/OpenMathLib/OpenBLAS/. Note that the default branch
is `develop` (a `master` branch is still present, but far out of date).

Build-time parameters can be chosen in `Makefile.rule`, see there for a short description of each option.
Most options can also be given directly on the command line as parameters to your `make` or `cmake` invocation.

### Dependencies

Building OpenBLAS requires the following to be installed:

* GNU Make or CMake
* A C compiler, e.g. GCC or Clang 
* A Fortran compiler (optional, for LAPACK)

In general, using a recent version of the compiler is strongly recommended.
If a Fortran compiler is not available,