It's the same under "real" DOS. The code from Github doesn't build without fixing the line endings and encoding. What seems to have happened, is that at some p

It's the same under "real" DOS. The code from Github doesn't build without fixing the line endings and encoding. What seems to have happened, is that at some point they opened it as UTF-8 in an editor, which replaced some Cp437 box drawing characters with U+FFFD (encoded as the byte sequence EF BF BD). You can replace these with any single byte and it will build, but making the comments and some TUI stuff look correct requires more editing.