The example TestEm8 requires CLHEP/Hist which is not part of CLHEP1.5 or CLHEP1.6 any more. Do you know if there is an interface to Hbook available somewhere?
TestEm8 needs to be migrated away from Hist. Histogramming will be removed from all extended/electromagnetic examples (histogramming through Hist was included for test purposes only). To temporarly run -without histogramming- use "gmake G4NOHIST=1" to build the example. For what concerns CLHEP/Hist, you need to install it manually on top of CLHEP (you can download it from the CLHEP_1.5 distribution from web). Histogramming using the new "analysis" module is shown in example/advanced applications.