I keep forgetting how to compile Xilinx libraries and import them into modelsim...so here goes a list
use compxlib from appropriate Xilinx version, select version of modelsim (in my case 10.0d)
--Will output to Xilinx\Ver##\ISE\verilog\modelsim_10dbli
In Modelsim, right click work, add library
DONE
Simulate and include the appropriate libraries as so...
vsim -L SimPrim_Vers10 -L UniMacro_Ver10 -L UniSim_Ver10 -L XilinxCoreLib_Ver10 work.afe_tb work.glbl
Remembering to include the global file glbl
Tada!