auc: no visible global function definition for 'var'
auc.roc.plot: no visible global function definition for 'par'
auc.roc.plot: no visible global function definition for 'plot'
auc.roc.plot: no visible global function definition for 'lines'
auc.roc.plot: no visible global function definition for 'abline'
auc.roc.plot: no visible global function definition for 'points'
auc.roc.plot: no visible global function definition for 'text'
auc.roc.plot: no visible global function definition for 'legend'
calibration.plot: no visible global function definition for 'qf'
calibration.plot: no visible global function definition for 'par'
calibration.plot: no visible global function definition for 'plot'
calibration.plot: no visible global function definition for 'abline'
calibration.plot: no visible global function definition for 'lines'
calibration.plot: no visible global function definition for 'points'
calibration.plot: no visible global function definition for 'text'
error.threshold.plot: no visible global function definition for 'par'
error.threshold.plot: no visible global function definition for 'plot'
error.threshold.plot: no visible global function definition for 'lines'
error.threshold.plot: no visible global function definition for
  'abline'
error.threshold.plot: no visible global function definition for
  'points'
error.threshold.plot: no visible global function definition for
  'legend'
presence.absence.hist: no visible global function definition for 'hist'
presence.absence.hist: no visible global function definition for
  'barplot'
presence.absence.hist: no visible global function definition for 'par'
presence.absence.hist: no visible global function definition for 'text'
presence.absence.hist: no visible global function definition for 'plot'
presence.absence.hist: no visible global function definition for
  'legend'
presence.absence.hist: no visible global function definition for
  'abline'
presence.absence.hist: no visible global function definition for
  'points'
presence.absence.simulation: no visible global function definition for
  'rbinom'
presence.absence.simulation: no visible global function definition for
  'rbeta'
presence.absence.summary: no visible global function definition for
  'par'
presence.absence.summary: no visible global function definition for
  'mtext'
Undefined global functions or variables:
  abline barplot hist legend lines mtext par plot points qf rbeta
  rbinom text var
Consider adding
  importFrom("graphics", "abline", "barplot", "hist", "legend", "lines",
             "mtext", "par", "plot", "points", "text")
  importFrom("stats", "qf", "rbeta", "rbinom", "var")
to your NAMESPACE file.