title: blosc compression in hdf5 via h5py
body: <p>I'm using h5py to create hdf5 files in python, and I'd like to use blosc as a compression filter. I first installed c-blosc from source via:</p>
  
  <pre><code>wget https://github.com/Blosc/c-blosc/archive/v1.9.1.tar.gz
  tar -xvf c-blosc-v1.9.1.tar.gz
  cd c-blosc-v1.9.1
  mkdir build
  cd build
  cmake -DCMAKE_INSTALL_PREFIX=/usr/local ..
  cmake --build .
  cmake --build . --target install
  </code></pre>
  
  <p>(note I use homebrew otherwise, so my /usr/local is writable without sudo)</p>
  
  <p>I then installed hdf5 v1.10.0 from source via:</p>
  
  <pre><code>wget http://www.hdfgroup.org/ftp/HDF5/releases/hdf5-1.10/hdf5-1.10.0/src/hdf5-1.10.0.tar.gz
  tar -xvf hdf5-1.10.0.tar.gz
  cd hdf5-1.10.0
  ./configure --enable-static=yes --enable-shared=yes --prefix=/usr/local/hdf5
  make &amp;&amp; make install
  </code></pre>
  
  <p>Finally I install h5py v2.6.0 from source via:</p>
  
  <pre><code>wget https://github.com/h5py/h5py/archive/2.6.0.tar.gz
  tar -xvf h5py-2.6.0.tar.gz
  cd h5py-2.6.0
  python setup.py install
  python setup.py install
  </code></pre>
  
  <p>However, when I fire up a python interpreter and run:</p>
  
  <pre><code>import h5py
  f = h5py.File('myFile.hdf5','w')
  dset = f.create_dataset("myData", (100, 100), compression=32001) 
  #32001 is blosc, see: https://www.hdfgroup.org/services/filters.html
  </code></pre>
  
  <p>I get the error "ValueError: Unknown compression filter number: 32001". What have I missed in my installation stream?</p>