[Gambas-user] cannot find symbol sinh in libc

[Demosthenes Koptsis]

hello,

according 
https://www.gnu.org/software/libc/manual/html_node/Hyperbolic-Functions.html#Hyperbolic-Functions

i have this external function

'double sinh (double x)
Public Extern sinh_C(x As Float) As Float Exec "sinh"

but i get the error "cannot find symbol sinh in libc"

why?