Real numbers on altera fpga de5

Hi all,

The problem that I m facing is that I have to perform some operations that are mostly logarithms exponentials multiplications division and additions on Real numbers.
From the simulation point of view there were no problems but now when I try to synthetize it I obtain an error message. I m using math_real library.
Are there any smart solutions in order to deal with Real numbers instead of write its own floating point unit??