The pack leaves out what an emulator installs itself
(validation.deliverable); the truth did not. RetroPie's gngeopi help
asked users to copy gngeo_data.zip, which make install puts in the
package's data directory, and amiberry's whdboot tree, scummvm's extra
data and dosbox-x's FREECG98.BMP went into platform lists as files to
bring.
The truth applies deliverable per platform and per build: an entry
nobody has to bring is kept and marked bundled, never added, still
corrected where the platform declares it. A rebuilt archive is
installed only when every member is. The runner written beside an
addition is the build that needs the file (_brought_by), and the
RetroPie sentence names only what its package's core must be given.