#include <cmath>
#include <stan/math.hpp>
template <typename T1>;
inline T1 gammaCDFderiv(T1 alpha, T1 x){
	using std::pow;
	T1 y = x;
	stan::math::var a = alpha;
	stan::math::var cdf = 0;
	cdf += gamma_cdf(x, a, 1);
	cdf.grad();
	return a.adj();
}