A4: no visible global function definition for 'dev.new'
Arrowhead: no visible global function definition for 'par'
Arrowhead: no visible global function definition for 'polygon'
Arrows: no visible global function definition for 'arrows'
Arrows: no visible global function definition for 'segments'
Arrows: no visible global function definition for 'par'
colorlegend: no visible global function definition for 'par'
colorlegend: no visible global function definition for 'rect'
colorlegend: no visible global function definition for 'segments'
colorlegend: no visible global function definition for 'text'
cylindersegment: no visible global function definition for 'polygon'
emptyplot: no visible global function definition for 'plot'
emptyplot: no visible global function definition for 'rect'
filledcircle: no visible global function definition for 'par'
filledcylinder: no visible global function definition for 'lines'
filledrectangle: no visible global function definition for 'polygon'
filledshape : expand: no visible global function definition for
  'approx'
filledshape: no visible global function definition for 'polygon'
filledshape: no visible global function definition for 'lines'
intpalette: no visible global function definition for 'col2rgb'
intpalette: no visible global function definition for 'approx'
intpalette: no visible global function definition for 'rgb'
plotcircle: no visible global function definition for 'par'
plotellipse: no visible global function definition for 'polygon'
plotellipse: no visible global function definition for 'lines'
rotatexy: no visible global function definition for 'par'
textflag: no visible global function definition for 'polygon'
textflag: no visible global function definition for 'lines'
textflag: no visible global function definition for 'text'
writelabel: no visible global function definition for 'par'
writelabel: no visible global function definition for 'mtext'
Undefined global functions or variables:
  approx arrows col2rgb dev.new lines mtext par plot polygon rect rgb
  segments text
Consider adding
  importFrom("grDevices", "col2rgb", "dev.new", "rgb")
  importFrom("graphics", "arrows", "lines", "mtext", "par", "plot",
             "polygon", "rect", "segments", "text")
  importFrom("stats", "approx")
to your NAMESPACE file.