undefined reference to 'erf'

[bibien]

Hallo
i'm having my first experience with fortran and the first script i want to run doesn't work (it is a script that i got from someone and normally spoken it must work)
this is what i did

g77setup
g77 tpm.f o- tpm.exe

the error that i get then is

undefined reference to 'erf'

what can i do about it?

thank you

 

[xwb]

At a guess, tpm.f probably uses something called erf and erf is not defined anywhere.