bpca.default: no visible binding for global variable 'sd'
dt.tools: no visible binding for global variable 'sd'
plot.bpca.2d : draw.obj: no visible global function definition for
  'points'
plot.bpca.2d : draw.obj: no visible global function definition for
  'text'
plot.bpca.2d : draw.var: no visible global function definition for
  'points'
plot.bpca.2d : draw.var: no visible global function definition for
  'text'
plot.bpca.2d : draw.var.seg: no visible global function definition for
  'segments'
plot.bpca.2d : draw.circles: no visible global function definition for
  'symbols'
plot.bpca.2d: no visible global function definition for 'plot'
plot.bpca.2d: no visible global function definition for 'abline'
plot.bpca.2d: no visible global function definition for 'identify'
plot.bpca.2d: no visible global function definition for 'arrows'
plot.bpca.2d: no visible global function definition for 'points'
plot.bpca.2d: no visible global function definition for 'text'
plot.bpca.2d: no visible global function definition for 'segments'
plot.bpca.2d: no visible global function definition for 'symbols'
plot.bpca.2d: no visible global function definition for 'chull'
plot.bpca.2d: no visible global function definition for 'polygon'
plot.bpca.3d: no visible global function definition for 'par'
plot.bpca.3d: no visible global function definition for 'text'
plot.bpca.3d: no visible global function definition for 'identify'
plot.qbpca: no visible global function definition for 'plot'
plot.qbpca: no visible global function definition for 'points'
plot.qbpca: no visible global function definition for 'legend'
qbpca: no visible global function definition for 'cor'
var.rdf: no visible global function definition for 'cor'
Undefined global functions or variables:
  abline arrows chull cor identify legend par plot points polygon sd
  segments symbols text
Consider adding
  importFrom("grDevices", "chull")
  importFrom("graphics", "abline", "arrows", "identify", "legend", "par",
             "plot", "points", "polygon", "segments", "symbols", "text")
  importFrom("stats", "cor", "sd")
to your NAMESPACE file.