  The next-to-next-to-leading order (NNLO) calculation of the effective Higgs
gluon coupling $C_1$ for the lightest Minimal Supersymmetric Standard Model
(MSSM) Higgs boson $h^0$ is presented. Selected numerical results for the total
production cross section of $h^0$ via gluon fusion at the LHC within the
effective field theory approach are shown in the NNLO approximation.
