QNX採用XML Schemas

各位大俠,在QNX6.5(IDE4.7)下若採用XML Schemas API(如下),會出現未定義的error,
但是已在Linker內的Other options加入了-lxml2的lib,但是仍然有error,請問如何處理?

undefined reference to ‘xmlSchemaCleanupType’
undefined reference to ‘xmlSchemaFree’
undefined reference to ‘xmlSchemaFreeParserCtxt’
undefined reference to ‘xmlSchemaFreeValidCtxt’
undefined reference to ‘xmlSchemaNewParserCtxt’
undefined reference to ‘xmlSchemaNewValidCtxt’
undefined reference to ‘xmlSchemaParse’
undefined reference to ‘xmlSchemaSetParserStructuredErrors’
undefined reference to ‘xmlSchemaValidateDoc’