"... command not found" in installing geant4

[gholaminejad]

Hello friends
while installing geant4 when I enter this command in terminal

cmake -DCMAKE_INSTALL_PREFIX=/usr/local/include/geant4-v11.1.2_install
/usr/local/include/geant4-v11.1.2_source
-DGEANT4_INSTALL_DATA=ON
-DGEANT4_INSTALL_EXAMPLES=ON
-DGEANT4_USE_OPENGL_X11=ON
-DGEANT4_USE_GDML=ON
-DGEANT4_USE_RAYTRACER_X11=ON
-DGEANT4_BUILD_MULTITHREADED=ON
-DGEANT4_USE_QT=ON

I am facing something like this…
Why command not found?!

[guembou]

Hi,
I guess you are failing to have all the details on the same line. having independent instructions and that’s the problem. Don’t just copy and paste, maybe.
Instead of

cmake -DCMAKE_INSTALL_PREFIX=/usr/local/include/geant4-v11.1.2_install
/usr/local/include/geant4-v11.1.2_source
-DGEANT4_INSTALL_DATA=ON
-DGEANT4_INSTALL_EXAMPLES=ON
-DGEANT4_USE_OPENGL_X11=ON
-DGEANT4_USE_GDML=ON
-DGEANT4_USE_RAYTRACER_X11=ON
-DGEANT4_BUILD_MULTITHREADED=ON
-DGEANT4_USE_QT=ON

try this →
cmake -DCMAKE_INSTALL_PREFIX=/usr/local/include/geant4-v11.1.2_install /usr/local/include/geant4-v11.1.2_source -DGEANT4_INSTALL_DATA=ON -DGEANT4_INSTALL_EXAMPLES=ON -DGEANT4_USE_OPENGL_X11=ON -DGEANT4_USE_GDML=ON -DGEANT4_USE_RAYTRACER_X11=ON -DGEANT4_BUILD_MULTITHREADED=ON -DGEANT4_USE_QT=ON

Please make sure the only space between active dir is “space”, not “enter” or “tab”.

[gholaminejad]

Oh yes, solved!
Thank you

[gholaminejad]

I installed geant4 but when I run example1 I get this error!

I don’t know what to do?

[guembou]

hi,
I read that it was a recent known issue with CMake 3.27 as reported here: 2556 – Changes to FindEXPAT in CMake 3.27 break Geant4PackageCache.cmake file.

The best solution suggested was to install Geant4 with the option -DGEANT4_INSTALL_PACKAGE_CACHE=OFF to disable the install of that file (Or to simply delete it from an existing install, which will not break anything).

Please, refer to the discussion [Issues Compiling a Geant4 Example on macOS: Incorrect Macro Invocation in Geant4PackageCache.cmake]

Please, also check whether you’ve installed all the required Software Required to Build Geant4.