I am using root 5.34/36 with pythia8223. I am using Ubuntu 16.04 64bit. I also tried this with root 6 and root 5.34/30 and pythia8226 with different permutations but problem is still the same.
So, my root is okay. I have a file ptmax.root and it is working fine. But there is a problem with pythia root interfacing. I have given the correct paths in bashrc file and makefile.inc but when i ‘make’ main91 or main92 it says ‘it requires root’. I also have installed the package pythia8-root-interface. Please help me.