snp.plotter : read.config: no visible global function definition for
  'read.table'
snp.plotter : retrieve.data: no visible global function definition for
  'read.delim'
snp.plotter : retrieve.data: no visible global function definition for
  'read.table'
snp.plotter : draw.plot.grid.setup: no visible global function
  definition for 'viewport'
snp.plotter : draw.plot.grid.setup: no visible global function
  definition for 'grid.layout'
snp.plotter : draw.plot.grid.setup: no visible global function
  definition for 'pushViewport'
snp.plotter : draw.plot.grid.setup: no visible global function
  definition for 'vpTree'
snp.plotter : draw.plot.grid.setup: no visible global function
  definition for 'vpList'
snp.plotter : draw.plot.grid.setup: no visible global function
  definition for 'textGrob'
snp.plotter : draw.plot.grid.setup: no visible global function
  definition for 'gpar'
snp.plotter : draw.plot.grid.setup: no visible global function
  definition for 'gTree'
snp.plotter : draw.plot.grid.setup: no visible global function
  definition for 'gList'
snp.plotter : draw.plot.grid.setup: no visible global function
  definition for 'grid.draw'
snp.plotter : draw.plot.grid.setup: no visible global function
  definition for 'grid.lines'
snp.plotter : draw.plot.grid.setup: no visible global function
  definition for 'head'
snp.plotter : draw.plot.grid.setup: no visible global function
  definition for 'tail'
snp.plotter : draw.plot.grid.setup: no visible global function
  definition for 'grid.xaxis'
snp.plotter : draw.plot.grid.setup: no visible global function
  definition for 'grid.text'
snp.plotter : draw.plot.grid.setup: no visible global function
  definition for 'grid.edit'
snp.plotter : draw.plot.grid.setup: no visible global function
  definition for 'grid.yaxis'
snp.plotter : draw.plot.grid.setup: no visible global function
  definition for 'segmentsGrob'
snp.plotter : draw.plot.grid.setup: no visible global function
  definition for 'unit'
snp.plotter : draw.legend: no visible global function definition for
  'viewport'
snp.plotter : draw.legend: no visible global function definition for
  'pushViewport'
snp.plotter : draw.legend: no visible global function definition for
  'gTree'
snp.plotter : draw.legend: no visible global function definition for
  'textGrob'
snp.plotter : draw.legend: no visible global function definition for
  'gpar'
snp.plotter : draw.legend: no visible global function definition for
  'pointsGrob'
snp.plotter : draw.legend: no visible global function definition for
  'grid.draw'
snp.plotter : draw.legend: no visible global function definition for
  'popViewport'
snp.plotter : draw.plot.grid.snp.names: no visible global function
  definition for 'textGrob'
snp.plotter : draw.plot.grid.snp.names: no visible global function
  definition for 'unit'
snp.plotter : draw.plot.grid.snp.names: no visible global function
  definition for 'gpar'
snp.plotter : draw.plot.grid.ss: no visible global function definition
  for 'grid.text'
snp.plotter : draw.plot.grid.ss: no visible global function definition
  for 'gpar'
snp.plotter : draw.plot.grid.ss: no visible global function definition
  for 'grid.points'
snp.plotter : draw.plot.grid.hap: no visible global function definition
  for 'grid.text'
snp.plotter : draw.plot.grid.hap: no visible global function definition
  for 'grid.points'
snp.plotter : draw.plot.grid.hap: no visible global function definition
  for 'gpar'
snp.plotter : draw.plot.grid.hap: no visible global function definition
  for 'grid.lines'
snp.plotter : draw.plot.ld.plot: no visible global function definition
  for 'heat.colors'
snp.plotter : draw.plot.ld.plot: no visible global function definition
  for 'cm.colors'
snp.plotter : draw.plot.ld.plot: no visible global function definition
  for 'read.table'
snp.plotter : draw.plot.ld.plot: no visible global function definition
  for 'topo.colors'
snp.plotter : draw.plot.ld.plot: no visible global function definition
  for 'gray.colors'
snp.plotter : draw.plot.ld.plot: no visible global function definition
  for 'rectGrob'
snp.plotter : draw.plot.ld.plot: no visible global function definition
  for 'gpar'
snp.plotter : draw.plot.ld.plot: no visible global function definition
  for 'textGrob'
snp.plotter : draw.plot.ld.plot: no visible global function definition
  for 'viewport'
snp.plotter : draw.plot.ld.plot: no visible global function definition
  for 'gTree'
snp.plotter : draw.plot.ld.plot: no visible global function definition
  for 'gList'
snp.plotter : draw.plot.ld.plot: no visible global function definition
  for 'popViewport'
snp.plotter : draw.plot.ld.plot: no visible global function definition
  for 'unit'
snp.plotter : draw.plot.ld.plot: no visible global function definition
  for 'pushViewport'
snp.plotter : draw.plot.ld.plot: no visible global function definition
  for 'grid.draw'
snp.plotter : create.color.list: no visible global function definition
  for 'head'
snp.plotter : create.symbol.list: no visible global function definition
  for 'head'
snp.plotter: no visible global function definition for 'pdf'
snp.plotter: no visible global function definition for 'postscript'
snp.plotter: no visible global function definition for 'head'
snp.plotter: no visible global function definition for 'grid.newpage'
snp.plotter: no visible global function definition for 'dev.cur'
snp.plotter: no visible global function definition for 'dev.off'
Undefined global functions or variables:
  cm.colors dev.cur dev.off gList gTree gpar gray.colors grid.draw
  grid.edit grid.layout grid.lines grid.newpage grid.points grid.text
  grid.xaxis grid.yaxis head heat.colors pdf pointsGrob popViewport
  postscript pushViewport read.delim read.table rectGrob segmentsGrob
  tail textGrob topo.colors unit viewport vpList vpTree
Consider adding
  importFrom("grDevices", "cm.colors", "dev.cur", "dev.off",
             "gray.colors", "heat.colors", "pdf", "postscript",
             "topo.colors")
  importFrom("utils", "head", "read.delim", "read.table", "tail")
to your NAMESPACE file.