  We perform a renormalisation group analysis of the next-to-minimal
supersymmetric standard model (NMSSM) based on the following constraints:
two-loop gauge coupling unification at a variable scale $M_X$, running the
gauge couplings through the low energy thresholds; universal soft supersymmetry
breaking parameters; correct electroweak symmetry breaking. The
phenomenological implications of our results include a standard model-like
Higgs boson of mass in the range 70-140 GeV.
