Rcpp_apply_generator: no visible global function definition for
  'packageVersion'
Rcpp_tapply_generator: no visible global function definition for
  'packageVersion'
anat: no visible global function definition for 'capture.output'
anatomy: no visible global function definition for 'capture.output'
bwplot2: no visible global function definition for 'capture.output'
gradient: no visible global function definition for 'colorRampPalette'
hImg: no visible global function definition for 'par'
hImg: no visible global function definition for 'dev.off'
hSvg: no visible global function definition for 'svg'
hSvg: no visible global function definition for 'par'
hSvg: no visible global function definition for 'dev.off'
kAnova: no visible global function definition for 'anova'
kCoef: no visible global function definition for 'coef'
kSave: no visible global function definition for 'write.table'
kmeans_plot: no visible global function definition for 'kmeans'
manhattan_plot: no visible global function definition for
  'complete.cases'
par.reset: no visible global function definition for 'par'
pp_plot: no visible global function definition for 'qbeta'
pp_plot : <anonymous>: no visible global function definition for 'rgb'
rcpp_apply_generator: no visible global function definition for
  'packageVersion'
rcpp_tapply_generator: no visible global function definition for
  'packageVersion'
read.cb: no visible global function definition for 'read.table'
remove_na: no visible global function definition for 'complete.cases'
size: no visible global function definition for 'object.size'
write.cb: no visible global function definition for 'write.table'
Undefined global functions or variables:
  anova capture.output coef colorRampPalette complete.cases dev.off
  kmeans object.size packageVersion par qbeta read.table rgb svg
  write.table
Consider adding
  importFrom("grDevices", "colorRampPalette", "dev.off", "rgb", "svg")
  importFrom("graphics", "par")
  importFrom("stats", "anova", "coef", "complete.cases", "kmeans",
             "qbeta")
  importFrom("utils", "capture.output", "object.size", "packageVersion",
             "read.table", "write.table")
to your NAMESPACE file.