.read.opus: no visible global function definition for ‘mtext’
fit.SpectraModel: no visible binding for global variable ‘na.omit’
fit.SpectraModel: no visible global function definition for ‘coef’
fit.SpectraModel: no visible global function definition for
  ‘as.formula’
ken.sto: no visible global function definition for ‘dist’
ken.sto: no visible global function definition for ‘dev.new’
ken.sto: no visible global function definition for ‘par’
ken.sto: no visible global function definition for ‘points’
plot.Spectra: no visible global function definition for ‘par’
plot.Spectra: no visible global function definition for ‘na.omit’
plot.Spectra: no visible global function definition for ‘axis’
plot.Spectra: no visible global function definition for ‘lines’
plot.Spectra: no visible global function definition for ‘box’
plot.Spectra: no visible global function definition for ‘mtext’
plot.ken.sto: no visible global function definition for ‘dev.new’
plot.ken.sto: no visible global function definition for ‘par’
plot.ken.sto: no visible global function definition for ‘points’
plot.trans: no visible global function definition for ‘dev.new’
plot.trans: no visible global function definition for ‘par’
plot.trans: no visible global function definition for ‘lines’
predict.SpectraPoints: no visible global function definition for ‘qt’
read.spc: no visible global function definition for ‘lines’
read.spc: no visible global function definition for ‘graphics.off’
read.spc: no visible global function definition for ‘abline’
trans: no visible global function definition for ‘sortedXyData’
trans: no visible global function definition for ‘chull’
trans: no visible global function definition for ‘approx’
trans: no visible global function definition for ‘dev.new’
trans: no visible global function definition for ‘par’
trans: no visible global function definition for ‘lines’
validate.SpectraPoints: no visible global function definition for
  ‘quantile’
fit,formula-SpectraPoints-data.frame: no visible binding for global
  variable ‘na.omit’
fit,formula-SpectraPoints-data.frame: no visible global function
  definition for ‘coef’
fit,formula-SpectraPoints-data.frame: no visible global function
  definition for ‘as.formula’
plot,Spectra-ANY: no visible global function definition for ‘par’
plot,Spectra-ANY: no visible global function definition for ‘na.omit’
plot,Spectra-ANY: no visible global function definition for ‘axis’
plot,Spectra-ANY: no visible global function definition for ‘lines’
plot,Spectra-ANY: no visible global function definition for ‘box’
plot,Spectra-ANY: no visible global function definition for ‘mtext’
predict,SpectraPoints: no visible global function definition for ‘qt’
read.opus,character: no visible global function definition for ‘mtext’
validate,SpectraPoints: no visible global function definition for
  ‘quantile’
Undefined global functions or variables:
  abline approx as.formula axis box chull coef dev.new dist
  graphics.off lines mtext na.omit par points qt quantile sortedXyData
Consider adding
  importFrom("grDevices", "chull", "dev.new", "graphics.off")
  importFrom("graphics", "abline", "axis", "box", "lines", "mtext",
             "par", "points")
  importFrom("stats", "approx", "as.formula", "coef", "dist", "na.omit",
             "qt", "quantile", "sortedXyData")
to your NAMESPACE file.