Set install var for python that would otherwise fail on mac
jansson support
Merge branch 'master' of https://github.com/janelia-flyem/buildem
merge origin
libjansson fix
libjansson fix
libjansson fix
neulib fix
neulib fix
neulib fix
libjansson fix
libjansson fix
libjansson fix
libjansson fix
libjansson fix
Update openvdb
Update README.md to include additional Janelia cluster lib in PYTHONPATH
Add tip on clean environment variables for troubleshooting builds.
vigra: Added a second patch to fix RandomForest import from hdf5 (open file in read-only mode).