as i explained earlier you might not need them all. (or perhaps you do)
programmers of librariers often present you everything, that doesnt mean that your code needs everything
but if they didnt provide it, you had to guess the names.. seams a bit harder to me
and now you can delete lines that you dont need (or mark them out).
simply mark out check if the code still works if ok you dont need it, if it stops you needed it.
I cannot tell you if the code examples you refer to are from the same date as this library
programmers can change whats in their code and how it works, and how it is divided accros their binaries.