Spack wants URL info even for external packages. Without it, I get
the following error:
NoURLError: Package SpectrumMpi has no version with a URL.
File "/home_local/serbanspack/spack/lib/spack/spack/repository.py", line 580, in get
self._instances[key] = package_class(copy)
File "/home_local/serbanspack/spack/lib/spack/spack/package.py", line 562, in __init__
f = fs.for_package_version(self, self.version)
File "/home_local/serbanspack/spack/lib/spack/spack/fetch_strategy.py", line 878, in for_package_version
url = pkg.url_for_version(version)
File "/home_local/serbanspack/spack/lib/spack/spack/package.py", line 682, in url_for_version
raise NoURLError(cls)