about using FriBidi

hello ,
this is abody from Ksa
 
I have installed successfully.
 
every thing is O.K.
 
To be sure, I've checked the installed version , which was :
 
GNU FriBidi configure 0.10.9.
 
But I am still having this problem :
 
Fatal error: Call to undefined function fribidi_log2vis() in /home/x/public_html/s2i/persian_log2vis.php on line 132
 
should i do somthing else than installing fribidi ?
 
I mean like enable or disable somthing ? or install sob Libs ?
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