-1 -1, is derived and applied to approximation of the usual fractional derivative. A software implementation of such quadratures was done by the recent Mathematica package OrthogonalPolynomials (cf. [A.S. Cvetkovi?, G.V. Milovanovi?, Facta Univ. Ser. Math. Inform. 19 (2004), 17-6] and [G.V. Milovanovi?, A.S. Cvetkovi?, Math. Balkanica 26 (2012), 169-84]). Several numerical examples are presented and they show the effectiveness of the proposed approach." />