As reported on HyperNews: http://hypernews.slac.stanford.edu/HyperNews/geant4/get/installconfig/1610.html Use of internal expat library is not exported to the geant4make setup correctly. The result is that the geant4make system will try to link to a system expat, whether or not this exists. Review the export of this setting to the geant4make.(c)sh scripts, both in the CMake scripts and the template files.
Fixed in tag cmake-V10-00-04