[xml] undefined reference

["carlos cano" <kanobult hotmail com>]

hi,
I am beginner programming C.
I installed the library libxml2 in my computer and compile it, but when used 
this library in any program, for exemple the follow rutine, when i compile 
occurs the error: undefined reference to xmlNewTextReaderFilename

xmlTextReaderPtr reader;
reader = xmlNewTextReaderFilename(filename);

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