Total inclusive charm production cross section in nucleon--nucleon collisionsas a function of $\sqrt{s}$. Data are from pA collisions for $\sqrt s< 100$ GeV and from pp collisions for $\sqrt s>100$ GeV. Data from pA collisionswere scaled by $1/A$ Results from NLO pQCD calculations (MNR) and theiruncertainties are shown as solid and dashed lines.