animate: no visible global function definition for 'dev.hold'
animate: no visible global function definition for 'dev.flush'
animate : <anonymous>: no visible global function definition for
  'dev.flush'
animate_stereo: no visible global function definition for 'rgb'
bases_little: no visible global function definition for 'combn'
basis_random: no visible global function definition for 'rnorm'
blank_plot: no visible global function definition for 'par'
blank_plot: no visible global function definition for 'plot'
display_andrews : render_data: no visible global function definition
  for 'segments'
display_andrews : render_data: no visible global function definition
  for 'lines'
display_depth: no visible global function definition for 'hcl'
display_depth : render_frame: no visible global function definition for
  'par'
display_depth : render_transition: no visible global function
  definition for 'rect'
display_depth : render_data: no visible global function definition for
  'points'
display_dist : render_frame: no visible global function definition for
  'par'
display_dist : render_frame: no visible global function definition for
  'plot'
display_dist : render_frame: no visible global function definition for
  'axis'
display_dist : render_transition: no visible global function definition
  for 'rect'
display_dist : render_data: no visible global function definition for
  'abline'
display_dist : render_data: no visible global function definition for
  'lines'
display_dist : render_data: no visible global function definition for
  'hist'
display_dist : render_data: no visible global function definition for
  'polygon'
display_dist : render_data: no visible global function definition for
  'density'
display_dist : render_data: no visible global function definition for
  'capture.output'
display_dist : render_data: no visible global function definition for
  'box'
display_dist : render_data: no visible global function definition for
  'segments'
display_dist : render_data: no visible global function definition for
  'text'
display_image : render_data: no visible global function definition for
  'image'
display_pcp : render_transition: no visible global function definition
  for 'rect'
display_pcp : render_data: no visible global function definition for
  'segments'
display_pcp : render_data: no visible global function definition for
  'lines'
display_scatmat : render_data: no visible global function definition
  for 'pairs'
display_stars : render_data: no visible global function definition for
  'stars'
display_stereo : render_frame: no visible global function definition
  for 'par'
display_trails : render_data: no visible global function definition for
  'segments'
display_trails : render_data: no visible global function definition for
  'points'
display_xy : render_frame: no visible global function definition for
  'par'
display_xy : render_transition: no visible global function definition
  for 'rect'
display_xy : render_data: no visible global function definition for
  'points'
display_xy : render_data: no visible global function definition for
  'lines'
draw_tour_axes: no visible global function definition for 'segments'
draw_tour_axes: no visible global function definition for 'lines'
draw_tour_axes: no visible global function definition for 'text'
find_frozen_path_peak: no visible global function definition for
  'optimize'
find_path_peak: no visible global function definition for 'optimize'
interpolate: no visible binding for global variable 'data'
lda_pp : <anonymous>: no visible global function definition for
  'manova'
lda_pp : <anonymous>: no visible global function definition for 'aov'
local_tour : generator: no visible global function definition for
  'runif'
path_dist: no visible global function definition for 'as.dist'
plot.path_curve: no visible binding for global variable 'step'
project3d: no visible global function definition for 'par'
render: no visible global function definition for 'dev.off'
rstudio_gd: no visible global function definition for 'dev.cur'
sphere: no visible global function definition for 'predict'
sphere: no visible global function definition for 'prcomp'
str.history_array: no visible global function definition for 'str'
Undefined global functions or variables:
  abline aov as.dist axis box capture.output combn data density dev.cur
  dev.flush dev.hold dev.off hcl hist image lines manova optimize pairs
  par plot points polygon prcomp predict rect rgb rnorm runif segments
  stars step str text
Consider adding
  importFrom("grDevices", "dev.cur", "dev.flush", "dev.hold", "dev.off",
             "hcl", "rgb")
  importFrom("graphics", "abline", "axis", "box", "hist", "image",
             "lines", "pairs", "par", "plot", "points", "polygon",
             "rect", "segments", "stars", "text")
  importFrom("stats", "aov", "as.dist", "density", "manova", "optimize",
             "prcomp", "predict", "rnorm", "runif", "step")
  importFrom("utils", "capture.output", "combn", "data", "str")
to your NAMESPACE file.