bentarrow : sarr: no visible global function definition for ‘segments’
coordinates: no visible global function definition for ‘par’
curvedarrow: no visible global function definition for ‘dist’
en.Amplifier: no visible global function definition for ‘segments’
en.Amplifier: no visible global function definition for ‘text’
en.Capacitator: no visible global function definition for ‘rect’
en.Capacitator: no visible global function definition for ‘segments’
en.Capacitator: no visible global function definition for ‘text’
en.Ground: no visible global function definition for ‘segments’
en.Node: no visible global function definition for ‘points’
en.Node: no visible global function definition for ‘text’
en.Resistor: no visible global function definition for ‘rect’
en.Resistor: no visible global function definition for ‘text’
en.Signal: no visible global function definition for ‘par’
en.Signal: no visible global function definition for ‘text’
en.Transistor: no visible global function definition for ‘segments’
plotmat: no visible global function definition for ‘par’
plotmat: no visible global function definition for ‘text’
plotmat: no visible binding for global variable ‘cycle’
plotmat: no visible global function definition for ‘dist’
plotweb: no visible global function definition for ‘par’
plotweb: no visible global function definition for ‘plot’
plotweb: no visible global function definition for ‘mtext’
plotweb: no visible global function definition for ‘text’
plotweb : circle: no visible global function definition for ‘lines’
plotweb: no visible global function definition for ‘arrows’
segmentarrow : sarr: no visible global function definition for
  ‘segments’
shadowbox: no visible global function definition for ‘par’
shadowbox: no visible global function definition for ‘polygon’
splitarrow : sarr: no visible global function definition for ‘segments’
straightarrow: no visible global function definition for ‘segments’
textdiamond: no visible global function definition for ‘par’
textempty: no visible global function definition for ‘strwidth’
textempty: no visible global function definition for ‘strheight’
textempty: no visible global function definition for ‘rect’
textplain: no visible global function definition for ‘text’
treearrow : sarr: no visible global function definition for ‘segments’
treearrow: no visible global function definition for ‘segments’
Undefined global functions or variables:
  arrows cycle dist lines mtext par plot points polygon rect segments
  strheight strwidth text
Consider adding
  importFrom("graphics", "arrows", "lines", "mtext", "par", "plot",
             "points", "polygon", "rect", "segments", "strheight",
             "strwidth", "text")
  importFrom("stats", "cycle", "dist")
to your NAMESPACE file.