https://gitlab.com/siesta-project/siesta is the link to get SIESTA tarballs
SEE ARCH.MAKE FILES ON https://gitlab.com/CUEA/cuea-meeting/...

FOR PARALLEL YOU NEED THE BELOW:-

$git clone https://gitlab.com/siesta-project/sie...
$cd siesta/Obj

$mkdir parallel
$cd parallel

$sudo apt-get install build-essential checkinstall
$sudo apt-get install openmpi-bin openmpi-doc libopenmpi-dev
$sudo apt-get install liblapack-dev
$sudo apt-get install libscalapack-mpi-dev
$sudo apt-get install libblacs-mpi-dev
$sudo apt-get install gfortran
$../../Src/obj_setup.sh
$make