problem with Post synthesis simulation

[gck]

leonardo no ibuf

I am generating post P&R vhdl file from Leonardo.

While compiling it in modelsim error is coming like no default binding for 'ibuf' and 'obuf'.

If I generate same file from the Xilinx then it includes simprim and unisim file. But file generated from Leonardo don't include any such file.

Pls help me
Program is of simple Full adder.

Thanks in advance