out-dated gmp-chudnovsky.c ing gmp 5.0.2

[Amir Hooshangi]

Hi

i want to try gmp-chudnovsky.c which hosted on
http://gmplib.org/pi-with-gmp.html. but i get undefined reference to `sqrt'
while compiling.
i'm using gmp version 5.0.2. i think the code is out dated.

regards