def METHOD_NAME (opt):
    grp_name = "cplex options (when --lp-lib=cplex is used)"
    grp = opt.add_option_group (grp_name)
    grp.add_option ("--cplex-path", action="store", type="string",
                                    dest="CPLEX_PATH", default = "",
                    help = "location of the cplex lib and include directories \
                            (by default use the one in 3rd directory)")
    grp.add_option ("--cplex-version", action="store", type="string",
                                    dest="CPLEX_VERSION", default = "",
                    help = "Version of CPLEX (e.g. for version 12.9.0, use 1290)")