evaluate.cond.utility.conversion.intpol: no visible global function
  definition for ‘approx’
evaluate.utility.endnode.intpol1d: no visible global function
  definition for ‘approx’
plot.utility.endnode.cond: no visible global function definition for
  ‘plot’
plot.utility.endnode.cond: no visible global function definition for
  ‘mtext’
plot.utility.endnode.discrete: no visible global function definition
  for ‘plot’
plot.utility.endnode.discrete: no visible global function definition
  for ‘lines’
plot.utility.endnode.discrete: no visible global function definition
  for ‘axis’
plot.utility.endnode.discrete: no visible global function definition
  for ‘abline’
plot.utility.endnode.discrete: no visible global function definition
  for ‘points’
plot.utility.endnode.firstavail: no visible global function definition
  for ‘plot’
plot.utility.endnode.firstavail: no visible global function definition
  for ‘mtext’
plot.utility.endnode.intpol1d: no visible global function definition
  for ‘points’
plot.utility.endnode.intpol2d: no visible global function definition
  for ‘lines’
utility.aggregate.mult: no visible global function definition for
  ‘uniroot’
utility.aggregation.plot: no visible global function definition for
  ‘contour’
utility.aggregation.plot: no visible global function definition for
  ‘image’
utility.aggregation.plot: no visible global function definition for
  ‘lines’
utility.aggregation.plot: no visible global function definition for
  ‘axis’
utility.aggregation.plot: no visible global function definition for
  ‘barplot’
utility.aggregation.plot: no visible global function definition for
  ‘text’
utility.aggregation.plot: no visible global function definition for
  ‘plot’
utility.calc.colors: no visible global function definition for
  ‘col2rgb’
utility.calc.colors: no visible global function definition for ‘rgb’
utility.conversion.plot: no visible global function definition for
  ‘plot’
utility.conversion.plot: no visible global function definition for
  ‘lines’
utility.conversion.plot: no visible global function definition for
  ‘points’
utility.endnode.plot1d: no visible global function definition for
  ‘plot’
utility.endnode.plot1d: no visible global function definition for
  ‘lines’
utility.endnode.plot1d: no visible global function definition for
  ‘axis’
utility.endnode.plot1d: no visible global function definition for
  ‘abline’
utility.endnode.plot2d: no visible global function definition for
  ‘image’
utility.plot: no visible global function definition for ‘plot’
utility.plotcolbox: no visible global function definition for ‘polygon’
utility.plotcolbox: no visible global function definition for ‘lines’
utility.plothierarchy: no visible global function definition for ‘par’
utility.plothierarchy: no visible global function definition for ‘plot’
utility.plothierarchy: no visible global function definition for ‘text’
utility.plothierarchy: no visible global function definition for
  ‘lines’
utility.plothierarchy: no visible global function definition for ‘grey’
utility.plotquantbox: no visible global function definition for
  ‘quantile’
utility.plotquantbox: no visible global function definition for ‘lines’
utility.plottable: no visible global function definition for ‘par’
utility.plottable: no visible global function definition for ‘plot’
utility.plottable: no visible global function definition for ‘text’
utility.plottable: no visible global function definition for ‘lines’
Undefined global functions or variables:
  abline approx axis barplot col2rgb contour grey image lines mtext par
  plot points polygon quantile rgb text uniroot
Consider adding
  importFrom("grDevices", "col2rgb", "grey", "rgb")
  importFrom("graphics", "abline", "axis", "barplot", "contour", "image",
             "lines", "mtext", "par", "plot", "points", "polygon",
             "text")
  importFrom("stats", "approx", "quantile", "uniroot")
to your NAMESPACE file.