[ROOT] Why I can't fill histgram from ntuple when sorce code is compiled.

From: Sugaya Masahiro (sugayam@post.kek.jp)
Date: Tue Jul 31 2001 - 20:45:57 MEST 

Hi rooters.
I have a probrem.

My root version is 3.01/06 linux egcs.

When I used interpreter, next code works
{
    TH1D hist("hist","hist",100,0,10);
    TFile file("test.root","UPDATE");
    TNtuple* ntup;
    ntup = (TNtuple*) file.Get("ntup");
    ntup->Draw("p>>hist","","goff");
    hist.Draw();
    file.Close();    
}
but , when I compiled next code using gcc

#include <TFile.h>
#include <TROOT.h>
#include <TH1.h>
#include <TNtuple.h>

TROOT root("root","root");
   
int main(){
    TH1D hist("hist","hist",100,0,10);
    TFile file("test.root","UPDATE");
    TNtuple* ntup;
    ntup = (TNtuple*) file.Get("ntup");
    ntup->Draw("p>>hist","","goff");
    hist.Draw();
    file.Close();    
}

The Histgram hist on the root file. did not filled.
Am I someting wrong? 
Is there something I have to do?

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