problem with header in qgis 2.8

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i have an old project based on qgis 1.6 i had to upgrade it to qgis 2.8 but during the make it seems that a lot of header or classes has disapeared by exemple in the 1.6 the classe QgsuniqueValuerenderer is present in the list but not in the version 2.8 of qgis and the for several classe do you have an idea ?

thanks



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