the paraview ebuild currently has a hdf5 use flag. However it doesn't enable functionality, it enable using system hdf5 instead of the internal copy. It is usually considered a good idea to use the system copy instead of the internal one. When I ported paraview to the cmake eclass I dropped the hdf5 flag for this reason after talking to other devs on irc.
Yeah, I've been pondering this in the past - if hdf5 just wouldn't be such a beast to build ;) But you are of course correct, we should really drop the use flag and link against the system hdf5. I'll do this later. Thanks for the heads up. cheers, Markus
paraview now uses system hdf5 exclusively. Thanks again for the note. cheers, Markus