compiling code:
--------------
- environment variable G4INSTALL where GEANT4 is installed

- for compiling use environment "source GEANT4/env.sh"

- if you want Menu GUI set the environment variables
  G4UI_USE_XM and G4VIS_USE

  the compiled code is in ${G4INSTALL}/bin/${G4SYSTEM}/
  called "FCALGui"

  FCALGui --help