Yes, run then build, and then it should be possible to run the executable
$ cd $HOME/geant4/geant4-11.0.0/examples/basic/B1-build
$ rm -Rf ./*
$ cmake -DCMAKE_PREFIX_PATH=$HOME/geant4/geant4-v11.0.0-install ..
$ make
$ ./exampleB1
Yes, run then build, and then it should be possible to run the executable
$ cd $HOME/geant4/geant4-11.0.0/examples/basic/B1-build
$ rm -Rf ./*
$ cmake -DCMAKE_PREFIX_PATH=$HOME/geant4/geant4-v11.0.0-install ..
$ make
$ ./exampleB1