M1. Each xSDK-compatible package must support either the community GNU Autoconf or CMake options3 as defined in the following document:
xSDK Community Installation Policies: GNU Autoconf and CMake Options.
The goal of this policy is to enable individual users, computing centers, and package managers (such as Spack) to install the package in a way that is compatible with other xSDK packages on the same system. It is understood that managing all the dependencies for a variety of packages is nontrivial and is not resolved by standard options.
3 Note that the package is free to use any mechanism, for example Python as PETSc does, to implement the options but to users they should appear as if a CMake or GNU Autoconf configure package.