The new HDF 5 is here:
http://hdf.ncsa.uiuc.edu/HDF5/
ftp://ftp.ncsa.uiuc.edu/HDF/HDF5/hdf5-1.2.2/src/

What's here:
in ./hdf3 is HDF3.2 - working

in ./hdf4 is HDF4.x - not yet working