pdf output in linux - fribidi.so

hi all, linux & php I'm not familiar with linux more... in windows there is a extension "php_fribidi.dll" for pdf output my code work with windows and create pdf well, but in linux an error accure that need fribidi.so module I just know that a module like 'fribidi.so' name must be used in linux. I found it and located it in modules path in linux... but it didn't work..I think that isn't the right fribidi.so file! or wrong path in the www, I couldn't find good help. I 'll be so glad if someone help me how to have a pdf output in the linux. Thanks, Shahrzad Khorrami