OK

Hmm, can you tell us which is the output of your ./configure for the
HDF5 library?  Mine is:

Features:
---------
                         dmalloc:  No
          Function Stack Tracing:  Disabled
                            GPFS:  No
       Strict File Format Checks:  Disabled
         HDF5 v1.4 Compatibility:  No
          I/O filters (external):  deflate
          I/O filters (internal):  shuffle,fletcher32
  Linux Large File Support (LFS):  Enabled
                             MPE:  No
                   Parallel HDF5:  No
                    Threadsafety:  Disabled
              High Level library:  Enabled

As you see, 'deflate' filter is listed as an external filter.  Are you
seeing the same?

Yes, I see the same info in src/libhdf5.settings ( attached ) deflate is listed as an external filter


SUMMARY OF THE HDF5 CONFIGURATION
=================================

HDF5 Version:           1.6.10
Configured on:          Tue Nov  2 23:27:19 CET 2010
Configured by:          p...@lp
Configure mode:         production
Host system:            i686-pc-linux-gnu
Byte sex:               little-endian
Libraries:              static, shared
Parallel support:       no
Installation point:     /usr/local/hdf5-1.6.10
Compiler:               /usr/bin/gcc (gcc-4.4.3)
Compiler switches:       -ansi -O0 -fomit-frame-pointer -finline-functions 
-UH5_DEBUG_API -DNDEBUG -I/usr/local/zlib-1.2.5/include -D_LARGEFILE_SOURCE 
-D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -D_POSIX_SOURCE -D_BSD_SOURCE 
Extra libraries:         -L/usr/local/zlib-1.2.5/lib -lz -lm 
Archiver:               ar
Ranlib:                 ranlib
Debugged Packages:      
API Tracing:            no

Configure Summary
Compiling Options:
               Compilation Mode:  Production
                     C Compiler:  gcc
                         CFLAGS:   -ansi -O0 -fomit-frame-pointer 
-finline-functions
                       CPPFLAGS:  -UH5_DEBUG_API -DNDEBUG 
-I/usr/local/zlib-1.2.5/include -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE 
-D_FILE_OFFSET_BITS=64 -D_POSIX_SOURCE -D_BSD_SOURCE 
                        LDFLAGS:   -L/usr/local/zlib-1.2.5/lib
                     Debug Mode:  None
               Shared Libraries:  Yes
               Static Libraries:  Yes
  Statically Linked Executables:  No
                        Tracing:  No
   Optimization Instrumentation:  No

Languages:
----------
                            C++:  No
                        Fortran:  No

Features:
---------
                        dmalloc:  No
         Function Stack Tracing:  Disabled
                           GPFS:  No
      Strict File Format Checks:  Disabled
        HDF5 v1.4 Compatibility:  No
         I/O filters (external):  deflate
         I/O filters (internal):  shuffle,fletcher32
 Linux Large File Support (LFS):  Enabled
                            MPE:  No
                  Parallel HDF5:  No
                   Threadsafety:  Disabled
             High Level library:  Enabled
------------------------------------------------------------------------------
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