I was trying to compile and install ROOT 6.28.06 in an workstation downloading the zip file from master repo of ROOT git repository. I used
cmake -DCMAKE_INSTALL_PREFIX=/opt/ROOT_CERN ../
Since both of those two commands provided no error / warning, I tried to install as
sudo make install
as I intended to install at /opt. The installation halted yielding error message as
CMake Error at cmake_install.cmake:257 (file): file INSTALL cannot find "/home/vega/CERNSOFT/ROOT/root-master/root_build/root-help.el": No such file or directory.
BTW, the workstation is not connected to any network.
Root Version: 6.28.06
Platform: Ubuntu 22.04 LTS Kernel 6.2.0-34-generic
Thanks and Regards