contributionBars: no visible global function definition for ‘dev.new’
contributionBars: no visible global function definition for ‘par’
contributionBars: no visible global function definition for ‘barplot’
contributionBars: no visible global function definition for ‘abline’
contributionBars: no visible global function definition for ‘mtext’
correlationPlotter: no visible global function definition for ‘cor’
correlationPlotter: no visible global function definition for ‘points’
makeAxes: no visible global function definition for ‘abline’
makeAxes: no visible global function definition for ‘points’
peeledHull: no visible global function definition for ‘chull’
peeledHull: no visible global function definition for ‘lines’
plotCircle: no visible global function definition for ‘plot’
plotCircle: no visible global function definition for ‘points’
plotPoints: no visible global function definition for ‘points’
plotText: no visible global function definition for ‘text’
prettyBars: no visible global function definition for ‘barplot’
prettyBars: no visible global function definition for ‘abline’
prettyBars: no visible global function definition for ‘text’
prettyGraphsColors: no visible global function definition for ‘colors’
prettyGraphsColors: no visible global function definition for ‘col2rgb’
prettyGraphsHSVColorSelection: no visible global function definition
  for ‘hsv’
prettyPlot: no visible global function definition for ‘plot’
prettyScree : add.alpha: no visible binding for global variable
  ‘col2rgb’
prettyScree : add.alpha : <anonymous>: no visible global function
  definition for ‘rgb’
prettyScree: no visible global function definition for ‘head’
prettyScree : <anonymous>: no visible global function definition for
  ‘tail’
prettyScree: no visible global function definition for ‘dev.new’
prettyScree: no visible global function definition for ‘par’
prettyScree: no visible global function definition for ‘plot’
prettyScree: no visible global function definition for ‘points’
prettyScree: no visible global function definition for ‘box’
prettyScree: no visible global function definition for ‘axis’
prettyScree: no visible global function definition for ‘mtext’
Undefined global functions or variables:
  abline axis barplot box chull col2rgb colors cor dev.new head hsv
  lines mtext par plot points rgb tail text
Consider adding
  importFrom("grDevices", "chull", "col2rgb", "colors", "dev.new", "hsv",
             "rgb")
  importFrom("graphics", "abline", "axis", "barplot", "box", "lines",
             "mtext", "par", "plot", "points", "text")
  importFrom("stats", "cor")
  importFrom("utils", "head", "tail")
to your NAMESPACE file.