How to call external libraries

ROOT
11

Thank you very much for your reply. I tried this but it still doesn’t work. Can I simply use fastjet header files using following lines in code:

#include "fastjet/PseudoJet.hh"  
#include "fastjet/ClusterSequence.hh"
#include "fastjet/Selector.hh"

gSystem->Load("~/Programs/fastjet-install/lib/libfastjet.so");
gSystem->Load("~/Programs/fastjet-install/lib/libfastjettools.so");
gSystem->AddIncludePath("~/Programs/fastjet-install/include");

Even if I make root access the header files somehow, it still shows an error (Using Fasjet Header Files in Root). I tried a lot of things but couldn’t make this work. #-o

Regards,
Swasti