I can't get any graph on hobbit

[FIGARO Nicolas]

Hi, 

After recompiling rrdtool 1.2.10 on aix 5.2 and hobbit 4.0.4, I have
infos in my rrd files (rrd fetch shows some entries). 

But I can't get any graph at the bottom of hobbit pages. 

I tried to run the cgi from command line, but I have the following
message : 
"xgetenv: Cannot find value for variable QUERY_STRING"

How can I set the QUERY_STRING properly and try to generate my graphs ? 

Thanks 

Nicolas FIGARO