about gmp-chudnovsky.c

[Roberto Premoli]

Hello,
I see the page https://gmplib.org/pi-with-gmp.html.
I downloaded gmp-chudnovsky.c and compiled it (gcc -O3 gmp-chudnovsky.c) 
but i get a lot of errors as follow:

gmp-chudnovsky.c:(.text+0x4d): undefined reference to "__gmpf_get_prec"
gmp-chudnovsky.c:(.text+0x7f): undefined reference to "sqrt"
gmp-chudnovsky.c:(.text+0x94): undefined reference to "__gmpf_set_d"

etc etc

How to make it working?

THanks,
Roberto

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