Installing lapack and openblas for building scipy on MacOS

install-and-setup-openblas-and-lapack.sh

#!/usr/env bash
brew install openblas
brew install lapack

# Set the following environment variables so that the build tools can find the libraries.

# openblas
export LDFLAGS="-L/usr/local/opt/openblas/lib $LDFLAGS"
export CPPFLAGS="-I/usr/local/opt/openblas/include $CPPFLAGS"
export PKG_CONFIG_PATH="/usr/local/opt/openblas/lib/pkgconfig $PKG_CONFIG_PATH"

# lapack
export LDFLAGS="-L/usr/local/opt/lapack/lib $LDFLAGS"
export CPPFLAGS="-I/usr/local/opt/lapack/include $CPPFLAGS"
export PKG_CONFIG_PATH="/usr/local/opt/lapack/lib/pkgconfig $PKG_CONFIG_PATH"

## tell compiler not to error out for implicit function declarations
export CFLAGS=-Wno-error=implicit-function-declaration

export LAPACK=/usr/local/opt/lapack/lib/liblapack.dylib
export BLAS=/usr/local/opt/openblas/lib/libopenblas.dylib