.. _in_spack: Spack Installation =================== Install Arbor ------------- To install Arbor using Spack, run ``spack install arbor``. Build Options ------------- Arbor can be built with various options, just like the regular CMake build. For instance, to have Spack build Arbor with MPI enabled, run ``spack install arbor +mpi``. Why use Spack? -------------- `Spack `_ is a package manager for supercomputers, Linux, and MacOS. It makes installing scientific software easy. Spack isn’t tied to a particular language; you can build a software stack in Python or R, link to libraries written in C, C++, or Fortran, and easily swap compilers or target specific microarchitectures. A powerful feature for users of scientific software is Spack's `Environment feature `_. One can define and store software environments for reuse, to generate container images or reproduce and rerun software workflows at a later time. Issues when using Spack ----------------------- On some systems initial Spack setup requires an extra step currently not shown in the up-front installations instructions of the `Spack documentation `_, which is adding the compilers on your system to Spack's configuration. If you don't, you may get this error: .. code-block:: bash No satisfying compiler available is compatible with a satisfying os The solution is to run (`as described further down in the official documentation `_): .. code-block:: bash ./spack compiler add To get help in case of problems, please make an issue at `Arbor's issues page `_.