I think that for the PIC16f877A you will need DT_INTS-14 version, not the DT_INTS-18 (which is only for the 18 series devices, I believe). Both versions, and a few other useful things, can be found here: http://dt.cambs.net/
Perhaps these things should find their way into the WIKI?
It's always a hunting trip to find and figure out the latest versions, but worth the effort when you eventually get there.