hpcDir :: FilePath  -- ^ \"dist/\" prefix
       -> FilePath  -- ^ Directory containing component's HPC .mix files
hpcDir distPref = distPref </> "hpc"
hpcDir :: FilePath  -- ^ \"dist/\" prefix
       -> FilePath
hpcDir distPref = distPref </> "hpc"
hpcDir distPref = distPref </> "hpc"