.N: no visible global function definition for 'mpfr'
LIHNPSD_plot_std4gr: no visible global function definition for
  'postscript'
LIHNPSD_plot_std4gr: no visible global function definition for 'par'
LIHNPSD_plot_std4gr: no visible global function definition for
  'dev.off'
LIHNPSD_plotcdf: no visible global function definition for 'par'
LIHNPSD_plotcdf: no visible global function definition for 'plot'
LIHNPSD_plotcdf: no visible global function definition for 'lines'
LIHNPSD_plotcdf: no visible global function definition for 'text'
LIHNPSD_plotlogpdf: no visible global function definition for 'par'
LIHNPSD_plotlogpdf: no visible global function definition for 'plot'
LIHNPSD_plotlogpdf: no visible global function definition for 'lines'
LIHNPSD_plotlogpdf: no visible global function definition for 'text'
LIHNPSD_plotpdf: no visible global function definition for 'par'
LIHNPSD_plotpdf: no visible global function definition for 'plot'
LIHNPSD_plotpdf: no visible global function definition for 'lines'
LIHNPSD_plotpdf: no visible global function definition for 'segments'
LIHNPSD_plotpdf: no visible global function definition for 'text'
LIHNPSD_plotpdf: no visible global function definition for 'legend'
LIHNPSD_plotqq: no visible global function definition for 'par'
LIHNPSD_plotqq: no visible global function definition for 'plot'
LIHNPSD_plotqq: no visible global function definition for 'abline'
LIHNPSD_plotqq: no visible global function definition for 'lines'
LIHNPSD_plotqq: no visible global function definition for 'legend'
LIHNPSD_plotqq: no visible global function definition for 'text'
LIHNPSD_prepare_data: no visible global function definition for 'var'
LIHNPSD_prepare_data: no visible global function definition for
  'skewness'
LIHNPSD_prepare_data: no visible global function definition for
  'kurtosis'
LIHNPSD_prepare_data: no visible global function definition for 'hist'
LIHNPSD_standardfit_fn: no visible global function definition for 'par'
LIHNPSD_standardfit_fn: no visible global function definition for
  'plot'
LIHNPSD_standardfit_fn: no visible global function definition for
  'lines'
LIHNPSD_standardfit_fn: no visible global function definition for
  'text'
LIHNPSD_standardfit_fn: no visible global function definition for
  'abline'
LIHNPSD_standardfit_test: no visible global function definition for
  'var'
LIHNPSD_standardfit_test: no visible global function definition for
  'skewness'
LIHNPSD_standardfit_test: no visible global function definition for
  'kurtosis'
LihnBetaPoly: no visible global function definition for 'Const'
LihnBetaPoly: no visible global function definition for 'getPrec'
LihnTildeFunction: no visible global function definition for 'Const'
LihnTildeFunction: no visible global function definition for 'getPrec'
prepare.LIHNPSD : D: no visible global function definition for 'mpfr'
prepare.LIHNPSD: no visible global function definition for 'Const'
psdunittest.LIHNPSD: no visible global function definition for
  'sintegral'
rawcdf.LIHNPSD : cdf: no visible global function definition for 'erf'
rawcdf.LIHNPSD : cdf: no visible global function definition for
  'T.Owen'
rawsn.LIHNPSD: no visible global function definition for 'erf'
standardfit.LIHNPSD: no visible global function definition for 'var'
standardfit.LIHNPSD: no visible global function definition for
  'skewness'
standardfit.LIHNPSD: no visible global function definition for
  'kurtosis'
standardfit.LIHNPSD: no visible global function definition for 'optimx'
tailindex_plot.LIHNPSD: no visible global function definition for
  'plot'
tailindex_plot.LIHNPSD: no visible global function definition for
  'abline'
Undefined global functions or variables:
  Const T.Owen abline dev.off erf getPrec hist kurtosis legend lines
  mpfr optimx par plot postscript segments sintegral skewness text var
Consider adding
  importFrom("grDevices", "dev.off", "postscript")
  importFrom("graphics", "abline", "hist", "legend", "lines", "par",
             "plot", "segments", "text")
  importFrom("stats", "var")
to your NAMESPACE file.