.igraph.progress.txt: no visible global function definition for
  ‘txtProgressBar’
.igraph.progress.txt: no visible global function definition for
  ‘setTxtProgressBar’
.igraph.shape.circle.plot: no visible global function definition for
  ‘symbols’
.igraph.shape.crectangle.plot: no visible global function definition
  for ‘symbols’
.igraph.shape.csquare.plot: no visible global function definition for
  ‘symbols’
.igraph.shape.pie.plot: no visible global function definition for
  ‘na.omit’
.igraph.shape.raster.plot: no visible global function definition for
  ‘rasterImage’
.igraph.shape.rectangle.plot: no visible global function definition for
  ‘symbols’
.igraph.shape.sphere.plot : <anonymous>: no visible global function
  definition for ‘col2rgb’
.igraph.shape.sphere.plot : <anonymous>: no visible global function
  definition for ‘as.raster’
.igraph.shape.sphere.plot: no visible global function definition for
  ‘rasterImage’
.igraph.shape.square.plot: no visible global function definition for
  ‘symbols’
.igraph.shape.vrectangle.plot: no visible global function definition
  for ‘symbols’
.print.edges.compressed.limit : fun: no visible global function
  definition for ‘capture.output’
.print.graph.attributes: no visible global function definition for
  ‘capture.output’
.tkigraph.about: no visible global function definition for
  ‘packageDescription’
.tkigraph.by.hand: no visible global function definition for ‘edit’
.tkigraph.calculate.clusters : plot.command: no visible global function
  definition for ‘hist’
.tkigraph.calculate.clusters : plot.command: no visible global function
  definition for ‘dev.new’
.tkigraph.calculate.clusters : plot.command: no visible global function
  definition for ‘plot’
.tkigraph.degree : plot.command: no visible global function definition
  for ‘hist’
.tkigraph.degree : plot.command: no visible global function definition
  for ‘dev.new’
.tkigraph.degree : plot.command: no visible global function definition
  for ‘plot’
.tkigraph.degree.dist: no visible global function definition for
  ‘dev.new’
.tkigraph.degree.dist: no visible global function definition for ‘hist’
.tkigraph.degree.dist: no visible global function definition for ‘plot’
.tkigraph.degree.dist: no visible global function definition for
  ‘lines’
.tkigraph.degree.dist: no visible global function definition for ‘coef’
.tkigraph.degree.dist: no visible global function definition for
  ‘legend’
.tkigraph.degree.dist: no visible global function definition for ‘vcov’
.tkigraph.export.adjacency: no visible global function definition for
  ‘write.table’
.tkigraph.export.edgelist: no visible global function definition for
  ‘write.table’
.tkigraph.help : <anonymous>: no visible global function definition for
  ‘browseURL’
.tkigraph.help.external: no visible global function definition for
  ‘browseURL’
.tkigraph.import.adjacency: no visible global function definition for
  ‘read.table’
.tkigraph.import.edgelist: no visible global function definition for
  ‘read.table’
.tkigraph.motifs.draw: no visible global function definition for
  ‘dev.new’
.tkigraph.motifs.draw: no visible global function definition for
  ‘layout’
.tkigraph.motifs.draw: no visible global function definition for
  ‘layout.show’
.tkigraph.motifs.draw: no visible global function definition for ‘par’
.tkigraph.motifs.draw: no visible global function definition for ‘plot’
.tkigraph.motifs.draw: no visible global function definition for ‘text’
.tkigraph.motifs.find: no visible global function definition for
  ‘dev.new’
.tkigraph.motifs.find: no visible global function definition for
  ‘barplot’
.tkigraph.motifs.find: no visible global function definition for
  ‘layout’
.tkigraph.motifs.find: no visible global function definition for
  ‘layout.show’
.tkigraph.motifs.find: no visible global function definition for ‘par’
.tkigraph.motifs.find: no visible global function definition for ‘plot’
.tkigraph.motifs.find: no visible global function definition for ‘text’
.tkigraph.plot : fun: no visible global function definition for
  ‘dev.new’
.tkigraph.plot.comp: no visible global function definition for
  ‘rainbow’
.tkigraph.showData : <anonymous>: no visible global function definition
  for ‘write.table’
.tkigraph.spinglass.community.dialog : plot.communities: no visible
  global function definition for ‘rainbow’
.tkplot.convert.color: no visible global function definition for
  ‘palette’
asPhylo.communities: no visible global function definition for
  ‘reorder’
asPhylo.igraphHRG: no visible global function definition for ‘reorder’
as_phylo.communities: no visible global function definition for
  ‘reorder’
as_phylo.igraphHRG: no visible global function definition for ‘reorder’
cluster.distribution: no visible global function definition for ‘hist’
component_distribution: no visible global function definition for
  ‘hist’
degree.distribution: no visible global function definition for ‘hist’
degree_distribution: no visible global function definition for ‘hist’
dendPlotDendrogram: no visible global function definition for ‘plot’
dendPlotHclust: no visible global function definition for ‘palette’
dendPlotHclust: no visible global function definition for ‘plot’
dendPlotHclust: no visible global function definition for ‘rect.hclust’
dendPlotPhylo: no visible global function definition for ‘palette’
dendPlotPhylo: no visible global function definition for ‘plot’
deprecated: no visible global function definition for ‘packageName’
ends: no visible global function definition for ‘na.omit’
gclust.app: no visible global function definition for ‘coef’
gclust.rsvt: no visible global function definition for ‘coef’
hrgPlotDendrogram: no visible global function definition for ‘plot’
hrgPlotHclust: no visible global function definition for ‘rainbow’
hrgPlotHclust: no visible global function definition for ‘plot’
hrgPlotHclust: no visible global function definition for ‘rect.hclust’
hrgPlotPhylo: no visible global function definition for ‘rainbow’
hrgPlotPhylo: no visible global function definition for ‘plot’
igraph.Arrows: no visible global function definition for ‘par’
igraph.Arrows: no visible global function definition for ‘xyinch’
igraph.Arrows: no visible global function definition for ‘segments’
igraph.Arrows: no visible global function definition for ‘xspline’
igraph.Arrows: no visible global function definition for ‘lines’
igraph.Arrows: no visible global function definition for ‘polygon’
igraph.polygon: no visible global function definition for ‘xspline’
indent_print: no visible global function definition for
  ‘capture.output’
layout.drl: no visible global function definition for ‘runif’
layout.sugiyama: no visible global function definition for ‘head’
layout_with_drl: no visible global function definition for ‘runif’
layout_with_sugiyama: no visible global function definition for ‘head’
mypie: no visible global function definition for ‘par’
mypie: no visible global function definition for ‘polygon’
nexus.get: no visible global function definition for ‘URLencode’
nexus.info: no visible global function definition for ‘URLencode’
nexus.list: no visible global function definition for ‘URLencode’
nexus.search: no visible global function definition for ‘URLencode’
nexus_get: no visible global function definition for ‘URLencode’
nexus_info: no visible global function definition for ‘URLencode’
nexus_list: no visible global function definition for ‘URLencode’
nexus_search: no visible global function definition for ‘URLencode’
plot.cohesiveBlocks: no visible global function definition for
  ‘rainbow’
plot.cohesiveBlocks: no visible global function definition for ‘plot’
plot.communities: no visible global function definition for ‘plot’
plot.igraph: no visible global function definition for ‘rainbow’
plot.igraph: no visible global function definition for ‘plot’
plot.igraph : plot.bezier: no visible global function definition for
  ‘polygon’
plot.igraph : loop: no visible global function definition for ‘text’
plot.igraph: no visible global function definition for ‘text’
plot.igraph: no visible global function definition for ‘par’
plot.igraph : <anonymous>: no visible global function definition for
  ‘text’
plot.sir: no visible global function definition for ‘plot’
plot.sir : <anonymous>: no visible global function definition for
  ‘lines’
plot.sir: no visible global function definition for ‘lines’
plotHierarchy: no visible global function definition for ‘plot’
plot_hierarchy: no visible global function definition for ‘plot’
r_pal: no visible global function definition for ‘palette’
scan_temp_norm: no visible global function definition for ‘sd’
scan_vertex_norm: no visible binding for global variable ‘sd’
time_bins.sir: no visible global function definition for ‘IQR’
Undefined global functions or variables:
  IQR URLencode as.raster barplot browseURL capture.output coef col2rgb
  dev.new edit head hist layout layout.show legend lines na.omit
  packageDescription packageName palette par plot polygon rainbow
  rasterImage read.table rect.hclust reorder runif sd segments
  setTxtProgressBar symbols text txtProgressBar vcov write.table
  xspline xyinch
Consider adding
  importFrom("grDevices", "as.raster", "col2rgb", "dev.new", "palette",
             "rainbow")
  importFrom("graphics", "barplot", "hist", "layout", "layout.show",
             "legend", "lines", "par", "plot", "polygon", "rasterImage",
             "segments", "symbols", "text", "xspline", "xyinch")
  importFrom("stats", "IQR", "coef", "na.omit", "rect.hclust", "reorder",
             "runif", "sd", "vcov")
  importFrom("utils", "URLencode", "browseURL", "capture.output", "edit",
             "head", "packageDescription", "packageName", "read.table",
             "setTxtProgressBar", "txtProgressBar", "write.table")
to your NAMESPACE file.