diff -ur root-5.26.00d.orig/tutorials/tree/cernbuild.C root-5.26.00d/tutorials/tree/cernbuild.C

--- root-5.26.00d.orig/tutorials/tree/cernbuild.C	2010-08-24 13:29:47.000000000 +0200

+++ root-5.26.00d/tutorials/tree/cernbuild.C	2010-08-29 10:20:56.069801363 +0200

@@ -18,6 +18,7 @@

    //The input file cern.dat is a copy of the CERN staff data base

    //from 1988

+   TString filename = "cernstaff.root";

    TString dir = gSystem->UnixPathName(gInterpreter->GetCurrentMacroName());

    dir.ReplaceAll("cernbuild.C","");

    dir.ReplaceAll("/./","/");

@@ -70,7 +71,10 @@

    tree->Write();

    fclose(fp);

-   if (get) return hfile;

    delete hfile;

+   if (get) {

+     hfile = TFile::Open(filename);

+     return hfile;

+   }

    return 0;

 }