vlib build
vlib build/xilinx

vlib build/xilinx/unisim
vmap unisim build/xilinx/unisim

vcom -93 -work unisim  xilinx/libsrc/unisims/unisim_vpkg.vhd
vcom -93 -work unisim  xilinx/libsrc/unisims/unisim_vcomp.vhd
vcom -93 -work unisim  xilinx/libsrc/unisims/unisim_smodel.vhd
vcom -93 -work unisim  xilinx/libsrc/unisims/unisim_vital.vhd