ifndef G4LIB_USE_EXPAT
LOADLIBS += -lexpat
endif
ifndef G4LIB_USE_ZLIB
ifdef G4LIB_USE_ZLIB
LOADLIBS += -lz
ifndef G4LIB_BUILD_ZLIB
LDLIBS2 += -lG4expat
ifdef G4LIB_BUILD_ZLIB
LDLIBS2 += -lG4zlib