install_openblas.sh

#!/usr/bin/env bash

set -e

apt-get update && apt-get install -y \
	build-essential cmake cython git gcc g++ gfortran libblas-dev liblapack-dev

echo 'Downloading OpenBLAS source code'
git clone --depth 1 https://github.com/xianyi/OpenBLAS.git
cd OpenBLAS
make DYNAMIC_ARCH=1 FC=gfortran -j $(nproc)
make DYNAMIC_ARCH=1 install

# Replacing system BLAS/updating APT OpenBLAS
# See details at
# https://github.com/xianyi/OpenBLAS/wiki/faq#debianlts
update-alternatives \
	--install /usr/lib/libblas.so.3 libblas.so.3 /opt/OpenBLAS/lib/libopenblas.so.0 41 \
	--slave /usr/lib/liblapack.so.3 liblapack.so.3 /opt/OpenBLAS/lib/libopenblas.so.0

# Environment setup
shell="$0"
echo 'export LD_LIBRARY_PATH=/opt/OpenBLAS/lib${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}}' >> ~/."${shell}rc"
echo '/opt/OpenBLAS/lib' > /etc/ld.so.conf.d/openblas.conf
ldconfig