RunMC uses the LHAPDF package (the Les Houches Accord PDF Interface) for the PDF sets [13].
A modified version of the LHAPDF library is located in ``main/lhapdf'', while some most
popular and most recent) PDF sets, such as CTEQ6, MRST2004, GRV,
are located in ``main/lhapdf/PDFsets''. The user can copy or link any PDF file
(taken from the LHAPDF web page) to this directory.