I have circuit which uses: .func myf(nom,tol) (nom+nom*(gauss(tol/5)) 

and a resistor which has a value {myf(400,0.1)} 

Besides these two I have a voltage source and I can simulate this circuit on a PC. However, on MacOS it holds simulation with: Missing model definition for MYF.

 

On both computers I am using the latest version of LTspice.

Is this a known bug?

Another thing: since you have no time-varying dependency in your function, you could simply define your component values as .params, which are evaluated before analysis, thus avoiding the need for another .func, e.g.:

R1 N001 0 {R1val}
.param tol 0.1
.param Rnom 400
.param R1val Rnom*(1+gauss(tol/5))

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Regards,
Tony