There is also `spack develop`, on which people are building hack/build/test loops. You can `spack develop` any package in spack, and easily build with a modifi

There is also `spack develop`, on which people are building hack/build/test loops. You can `spack develop` any package in spack, and easily build with a modified version of something. See also https://github.com/sandialabs/spack-manager https://github.com/sandialabs/spack-manager.