expand: no visible global function definition for ‘tail’
header.info: no visible global function definition for ‘mmap’
header.info: no visible global function definition for ‘char’
header.info: no visible global function definition for ‘is.mmap’
header.info: no visible global function definition for ‘munmap’
plot.stft: no visible global function definition for ‘gray’
plot.stft: no visible global function definition for ‘layout’
plot.stft: no visible global function definition for ‘lines’
plot.stft: no visible global function definition for ‘abline’
plot.stft: no visible global function definition for ‘tail’
plot.stft: no visible global function definition for ‘col2rgb’
plot.stft: no visible global function definition for ‘palette’
plot.stft: no visible global function definition for ‘rgb’
plot.stft: no visible global function definition for ‘points’
plot.stft: no visible global function definition for ‘image’
print.AccData: no visible global function definition for ‘object.size’
print.AccData: no visible global function definition for ‘tail’
print.VirtAccData: no visible global function definition for ‘tail’
print.stft: no visible global function definition for ‘tail’
pseudolines: no visible global function definition for ‘points’
pseudolines: no visible global function definition for ‘lines’
read.bin: no visible global function definition for ‘mmap’
read.bin: no visible global function definition for ‘char’
read.bin: no visible global function definition for ‘is.mmap’
read.bin: no visible global function definition for ‘munmap’
read.bin: no visible global function definition for ‘uint8’
read.bin: no visible global function definition for ‘txtProgressBar’
read.bin: no visible global function definition for ‘tail’
read.bin: no visible global function definition for ‘setTxtProgressBar’
read.bin: no visible global function definition for ‘object.size’
shift: no visible global function definition for ‘tail’
stftcalc: no visible global function definition for ‘txtProgressBar’
stftcalc: no visible global function definition for ‘setTxtProgressBar’
Undefined global functions or variables:
  abline char col2rgb gray image is.mmap layout lines mmap munmap
  object.size palette points rgb setTxtProgressBar tail txtProgressBar
  uint8
Consider adding
  importFrom("grDevices", "col2rgb", "gray", "palette", "rgb")
  importFrom("graphics", "abline", "image", "layout", "lines", "points")
  importFrom("utils", "object.size", "setTxtProgressBar", "tail",
             "txtProgressBar")
to your NAMESPACE file.