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After testing, it may be discovered that certain applications may not run with Python 2.7.13 64-bit due to unresolved/conflicting dependencies (e.g., 32-bit Python modules, Matlab2016b, Qt5, etc.) or other reasons. If such dependencies cannot currently be resolved, Python developers may invoke the following environment settings in a wrapper script or similar to launch the application using the older instance of Python instead:

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1. Add the previous Python instance to your environment:
   
   export PYTHON_ROOT=${LCLS_ROOT}/package/python/python2.7.4
   
   
2. Add the previous Python binaries to your environment:
   
   export PATH=${PYTHON_ROOT}/bin:${PATH}
   
   
3. Add the old Python libraries and their dependencies to your environment:
   
   export LD_LIBRARY_PATH=${}
   
   
4. [Optional] $ORACLE_HOME
   
   export ORACLE_HOME=package/oracle/product/11.1.0.6/client
   
   
   
5. [Optional] $QT_HOME
6. [Optional] Matlab