- remove the old LGPL license headers from all files in Spack - add SPDX headers to all files - core and most packages are (Apache-2.0 OR MIT) - a very small number of remaining packages are LGPL-2.1-only
* new file: var/spack/repos/builtin/packages/py-backcall/package.py * Update package.py * Update package.py * Update package.py * Update package.py