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The HDF5 library has internal free lists of memory structures, which can confuse memory allocation checking tools like valgrind and Purify. Also, in HDF5-1.6, HDF5 was writing out "known empty, but uninitialized" portions of memory, which cause memory checkers to complain about.

If using a tool like valgrind or Purify, then build the HDF5 distribution as follows so that you do not get to avoid getting false memory leaks reported: