C:\Program Files\geant4_10_06-build>cmake -DGEANT4_USE_OPENGL_WIN32=ON DGEANT4_USE_GDML=ON "C:/Program Files/geant4_10_06" -- Found OpenGL: opengl32 -- Pre-configuring dataset G4NDL (4.6) -- Pre-configuring dataset G4EMLOW (7.9) -- Pre-configuring dataset PhotonEvaporation (5.5) -- Pre-configuring dataset RadioactiveDecay (5.4) -- Pre-configuring dataset G4PARTICLEXS (2.1) -- Pre-configuring dataset G4PII (1.3) -- Pre-configuring dataset RealSurface (2.1.1) -- Pre-configuring dataset G4SAIDDATA (2.0) -- Pre-configuring dataset G4ABLA (3.1) -- Pre-configuring dataset G4INCL (1.0) -- Pre-configuring dataset G4ENSDFSTATE (2.2) *WARNING* Geant4 has been pre-configured to look for datasets in the directory: C:/Program Files/geant4_10_06-install/share/Geant4-10.6.0/data but the following datasets are NOT present on disk at that location: G4NDL (4.6) G4EMLOW (7.9) PhotonEvaporation (5.5) RadioactiveDecay (5.4) G4PARTICLEXS (2.1) G4PII (1.3) RealSurface (2.1.1) G4SAIDDATA (2.0) G4ABLA (3.1) G4INCL (1.0) G4ENSDFSTATE (2.2) If you want to have these datasets installed automatically simply re-run cmake and set the GEANT4_INSTALL_DATA variable to ON. This will configure the build to download and install these datasets for you. For example, on the command line, do: cmake -DGEANT4_INSTALL_DATA=ON The variable can also be toggled in ccmake or cmake-gui. If you're running on a Windows system, this is the best solution as CMake will unpack the datasets for you without any further software being required Alternatively, you can install these datasets manually now or after you have installed Geant4. To do this, download the following files: https://cern.ch/geant4-data/datasets/G4NDL.4.6.tar.gz https://cern.ch/geant4-data/datasets/G4EMLOW.7.9.tar.gz https://cern.ch/geant4-data/datasets/G4PhotonEvaporation.5.5.tar.gz https://cern.ch/geant4-data/datasets/G4RadioactiveDecay.5.4.tar.gz https://cern.ch/geant4-data/datasets/G4PARTICLEXS.2.1.tar.gz https://cern.ch/geant4-data/datasets/G4PII.1.3.tar.gz https://cern.ch/geant4-data/datasets/G4RealSurface.2.1.1.tar.gz https://cern.ch/geant4-data/datasets/G4SAIDDATA.2.0.tar.gz https://cern.ch/geant4-data/datasets/G4ABLA.3.1.tar.gz https://cern.ch/geant4-data/datasets/G4INCL.1.0.tar.gz https://cern.ch/geant4-data/datasets/G4ENSDFSTATE.2.2.tar.gz and unpack them under the directory: C:/Program Files/geant4_10_06-install/share/Geant4-10.6.0/data As we supply the datasets packed in gzipped tar files, you will need the 'tar' utility to unpack them. Nota bene: Missing datasets will not affect or break compilation and installation of the Geant4 libraries. -- The following Geant4 features are enabled: GEANT4_BUILD_CXXSTD: Compiling against C++ Standard '17' GEANT4_USE_OPENGL_WIN32: Build OpenGL driver with Win32 support -- Configuring done -- Generating done -- Build files have been written to: C:/Program Files/geant4_10_06-build