abc: no visible global function definition for 'na.omit'
abc: no visible global function definition for 'lsfit'
abc: no visible global function definition for 'mad'
abc: no visible global function definition for 'predict'
abc: no visible binding for global variable 'median'
abc: no visible global function definition for 'coef'
cv4abc: no visible global function definition for 'runif'
cv4abc: no visible global function definition for 'na.omit'
cv4postpr: no visible global function definition for 'na.omit'
cv4postpr: no visible global function definition for 'runif'
expected.deviance: no visible global function definition for 'na.omit'
getmode: no visible global function definition for 'density'
gfitpca : loc2plot: no visible global function definition for 'fitted'
gfitpca: no visible global function definition for 'prcomp'
gfitpca: no visible global function definition for 'predict'
gfitpca: no visible global function definition for 'legend'
hist.abc: no visible global function definition for
  'deviceIsInteractive'
hist.abc: no visible global function definition for 'as.graphicsAnnot'
hist.abc: no visible global function definition for 'devAskNewPage'
hist.abc: no visible global function definition for 'pdf'
hist.abc: no visible global function definition for 'par'
hist.abc: no visible global function definition for 'hist'
hist.abc: no visible global function definition for 'abline'
hist.abc: no visible global function definition for 'dev.off'
normalise: no visible global function definition for 'mad'
plot.abc: no visible global function definition for
  'deviceIsInteractive'
plot.abc: no visible global function definition for 'devAskNewPage'
plot.abc: no visible global function definition for 'pdf'
plot.abc: no visible global function definition for 'par'
plot.abc: no visible global function definition for 'density'
plot.abc: no visible global function definition for 'title'
plot.abc: no visible global function definition for 'lines'
plot.abc: no visible global function definition for 'segments'
plot.abc: no visible global function definition for 'mtext'
plot.abc: no visible global function definition for 'qqnorm'
plot.abc: no visible global function definition for 'qqline'
plot.abc: no visible global function definition for 'dev.off'
plot.cv4abc: no visible global function definition for
  'deviceIsInteractive'
plot.cv4abc: no visible global function definition for
  'as.graphicsAnnot'
plot.cv4abc: no visible global function definition for 'heat.colors'
plot.cv4abc: no visible global function definition for 'devAskNewPage'
plot.cv4abc: no visible global function definition for 'pdf'
plot.cv4abc: no visible global function definition for 'abline'
plot.cv4abc: no visible global function definition for 'dev.off'
plot.cv4postpr: no visible global function definition for
  'deviceIsInteractive'
plot.cv4postpr: no visible global function definition for
  'devAskNewPage'
plot.cv4postpr: no visible global function definition for 'pdf'
plot.cv4postpr: no visible global function definition for 'par'
plot.cv4postpr: no visible global function definition for 'barplot'
plot.cv4postpr: no visible global function definition for 'title'
plot.cv4postpr: no visible global function definition for 'dev.off'
plot.gfit: no visible global function definition for 'hist'
plot.gfit: no visible global function definition for 'abline'
plot.gfit: no visible global function definition for 'legend'
postpr: no visible global function definition for 'na.omit'
postpr: no visible global function definition for 'quantile'
postpr: no visible global function definition for 'as.formula'
postpr: no visible global function definition for 'predict'
summary.abc: no visible binding for global variable 'quantile'
summary.abc: no visible binding for global variable 'weighted.mean'
summary.cv4abc: no visible binding for global variable 'var'
Undefined global functions or variables:
  abline as.formula as.graphicsAnnot barplot coef density dev.off
  devAskNewPage deviceIsInteractive fitted heat.colors hist legend
  lines lsfit mad median mtext na.omit par pdf prcomp predict qqline
  qqnorm quantile runif segments title var weighted.mean
Consider adding
  importFrom("grDevices", "as.graphicsAnnot", "dev.off", "devAskNewPage",
             "deviceIsInteractive", "heat.colors", "pdf")
  importFrom("graphics", "abline", "barplot", "hist", "legend", "lines",
             "mtext", "par", "segments", "title")
  importFrom("stats", "as.formula", "coef", "density", "fitted", "lsfit",
             "mad", "median", "na.omit", "prcomp", "predict", "qqline",
             "qqnorm", "quantile", "runif", "var", "weighted.mean")
to your NAMESPACE file.