cpa : OpenX: no visible global function definition for 'tclvalue'
cpa : OpenX: no visible global function definition for 'tkgetOpenFile'
cpa : OpenX: no visible global function definition for 'read.table'
cpa : OpenV: no visible global function definition for 'tclvalue'
cpa : OpenV: no visible global function definition for 'tkgetOpenFile'
cpa : OpenV: no visible global function definition for 'read.table'
cpa : OpenA: no visible global function definition for 'tclvalue'
cpa : OpenA: no visible global function definition for 'tkgetOpenFile'
cpa : OpenA: no visible global function definition for 'read.table'
cpa : Close: no visible global function definition for 'tkdestroy'
cpa : PlotDAG: no visible global function definition for 'par'
cpa : PlotDAG: no visible global function definition for 'arrows'
cpa : PlotDAG: no visible global function definition for 'palette'
cpa : PlotDAG: no visible global function definition for 'text'
cpa : OnOK: no visible global function definition for 'as.formula'
cpa : OnOK: no visible global function definition for 'lm'
cpa : OnOK: no visible global function definition for 'coef'
cpa : OnOK: no visible global function definition for 'pchisq'
cpa : OnOK: no visible global function definition for 'tkmessageBox'
cpa : OnOK: no visible global function definition for 'tclvalue'
cpa : OnOK: no visible global function definition for 'tktoplevel'
cpa : OnOK: no visible global function definition for 'tclVar'
cpa : OnOK: no visible global function definition for 'tkentry'
cpa : OnOK: no visible global function definition for 'tkgrid'
cpa : OnOK: no visible global function definition for 'tklabel'
cpa : OnOK : Save: no visible global function definition for 'tclvalue'
cpa : OnOK : Save: no visible global function definition for
  'tkdestroy'
cpa : OnOK: no visible global function definition for 'tkbutton'
cpa : OnOK: no visible global function definition for 'tkbind'
cpa : OnOK: no visible global function definition for 'tkfocus'
cpa: no visible global function definition for 'tktoplevel'
cpa: no visible global function definition for 'tkwm.title'
cpa: no visible global function definition for 'tkbutton'
cpa: no visible global function definition for 'tkgrid'
cpa: no visible global function definition for 'tklabel'
cpa: no visible global function definition for 'tkfocus'
Undefined global functions or variables:
  arrows as.formula coef lm palette par pchisq read.table tclVar
  tclvalue text tkbind tkbutton tkdestroy tkentry tkfocus tkgetOpenFile
  tkgrid tklabel tkmessageBox tktoplevel tkwm.title
Consider adding
  importFrom("grDevices", "palette")
  importFrom("graphics", "arrows", "par", "text")
  importFrom("stats", "as.formula", "coef", "lm", "pchisq")
  importFrom("utils", "read.table")
to your NAMESPACE file.