Just dashed off some quick Porting Hints for Redland, Raptor and Rasqal mostly for win32, based on what I've heard from various people and described in email from time to time.
I'm pretty confident Raptor is straightforward, quite confident about Rasqal (no requirements but Raptor) but then Redland and the language bindings can take a lot of optional libraries (SleepycatDB/BDB, MySQL, ...).