This is what You need:
Code:

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function player_move()
{
	while(1)
	{
 	vec_diff(temp,my_target,my.pos); //my_target maybe You ent pos
	result = vec_to_angle(my_angle,temp);
	my._speed = 10;
	actor_turnto(my_angle.PAN)
	wait(1);	
	}
}

function actor_turnto(angle)
{
	angle = ang(angle - MY.PAN);
	if (angle > 10) {temp = my._speed;}
	else{
		if(angle < -10){temp = -my._speed;}
		else{temp = my._speed * angle * 0.1;}
		}
	MY.PAN += temp * time_step *2;//change this to faster turning
}
 

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I've checked it and its 100% working