Isn't the standard practice on windows to rely on the supplier's final binary version? Since you have a limited set (7, vista, xp) to care about and they're sometimes the same, why would you actually compile third party libs like that?
If the project maintainer doesn't include binaries, and nobody else posts them, then the user doesn't have a choice.
If the project maintainer doesn't include binaries, and nobody else posts them, then the user doesn't have a choice.