FIX: compile error due to dependent base class lookup failure
FIX: compile error due to dependent base class lookup failure

trshaffer/cvmfs,reneme/cvmfs,cvmfs-testing/cvmfs,Moliholy/cvmfs,Gangbiao/cvmfs,cvmfs/cvmfs,alhowaidi/cvmfsNDN,cvmfs/cvmfs,djw8605/cvmfs,djw8605/cvmfs,alhowaidi/cvmfsNDN,cvmfs-testing/cvmfs,cvmfs/cvmfs,MicBrain/cvmfs,reneme/cvmfs,Moliholy/cvmfs,djw8605/cvmfs,cvmfs-testing/cvmfs,Moliholy/cvmfs,trshaffer/cvmfs,reneme/cvmfs,MicBrain/cvmfs,DrDaveD/cvmfs,alhowaidi/cvmfsNDN,trshaffer/cvmfs,reneme/cvmfs,DrDaveD/cvmfs,MicBrain/cvmfs,alhowaidi/cvmfsNDN,DrDaveD/cvmfs,MicBrain/cvmfs,trshaffer/cvmfs,Moliholy/cvmfs,DrDaveD/cvmfs,cvmfs/cvmfs,djw8605/cvmfs,MicBrain/cvmfs,djw8605/cvmfs,Gangbiao/cvmfs,Gangbiao/cvmfs,DrDaveD/cvmfs,cvmfs-testing/cvmfs,Gangbiao/cvmfs,Gangbiao/cvmfs,DrDaveD/cvmfs,Moliholy/cvmfs,reneme/cvmfs,cvmfs-testing/cvmfs,cvmfs/cvmfs,cvmfs/cvmfs,trshaffer/cvmfs,DrDaveD/cvmfs,cvmfs/cvmfs,alhowaidi/cvmfsNDN