We are in the process of integrating and merging PyGDF and LibGDF into a unified library called cuDF. This is a part of RAPIDS project and will take place over the next few weeks. All development has moved from https://github.com/gpuopenanalytics to this org.
For more information see the announcement and details about the RAPIDS project https://rapids.ai
To build and install libGDF see the libGDF README
To build and install pyGDF see the pyGDF README