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Hi, I have compiz installed, and I tried to run this small code: gStyle->SetCanvasPreferGL(kTRUE); TCanvas *gltest = new TCanvas("gltest","gltest"); gltest->cd(); TH2D*h = new TH2D("h","t",10,0,10,10,0,20); h->Fill(1,2); h->Fill(1,2); h->Fill(1,2); h->Fill(4,5); h->Fill(6,2); h->Fill(9,2); h->Fill(5,2); h->Fill(4,3); h->Draw("GLLEGO"); but I get this warning : Error in : RGL[.so | .sl | .dl | .a | .dll] does not exist in .:/home/poss/root/lib:/root/cint/cint/stl Do I need to install something new ? Thanks.