Package check result: NOTE

Check: CRAN incoming feasibility, Result: NOTE
  Maintainer: ‘Seung W. Choi <schoi@austin.utexas.edu>’
  
  Suggests or Enhances not in mainstream repositories:
    gurobi

Check: package dependencies, Result: NOTE
  Package suggested but not available for checking: ‘gurobi’

No changes to worse in reverse depends.