- passed lib-depends-check and port-lib-depends-check
- passed portcheck
- works with clang8

- engine may also contain valve eula still?  unsafe to package
- game code ports also unpackageable, license states permission to redistribute
  in source or object but for use with original half-life engine.
  https://github.com/FWGS/xash-extras/issues/2
- extras.pak referenced in readme with url to fetch, but can't be
  packaged, either.
