S4methodsList: no visible global function definition for ‘showMethods’
S4methodsList: no visible global function definition for ‘head’
computeTabSpaces: no visible global function definition for ‘tail’
qeditor: no visible global function definition for ‘tail’
qexport.QGraphicsScene: no visible global function definition for
  ‘tail’
qexport.QWidget: no visible global function definition for ‘tail’
qgetColor: no visible global function definition for ‘rgb’
qpager: no visible global function definition for ‘is’
qrecover: no visible global function definition for ‘limitedLabels’
qrepl: no visible global function definition for ‘capture.output’
qrepl : executeCode: no visible global function definition for ‘is’
qrepl : executeCode: no visible global function definition for ‘xtable’
qrepl : executeCode: no visible global function definition for
  ‘capture.output’
qrepl : runHandler2: no visible global function definition for ‘is’
qreplu: no visible global function definition for ‘capture.output’
qreplu : setEnv: no visible global function definition for
  ‘capture.output’
qreplu : processCodeIfReady: no visible global function definition for
  ‘is’
qreplu : executeCode: no visible global function definition for ‘is’
qreplu : executeCode: no visible global function definition for
  ‘capture.output’
qstr.default: no visible global function definition for ‘is’
qstr.default: no visible global function definition for
  ‘capture.output’
qstr.environment: no visible global function definition for ‘is’
qstr.function: no visible global function definition for
  ‘capture.output’
qstr.list: no visible global function definition for ‘is’
qstr.listOrEnv: no visible global function definition for ‘is’
tryParseEval: no visible global function definition for ‘is’
tryParseEval: no visible global function definition for
  ‘capture.output’
Undefined global functions or variables:
  capture.output head is limitedLabels rgb showMethods tail xtable
Consider adding
  importFrom("grDevices", "rgb")
  importFrom("methods", "is", "showMethods")
  importFrom("utils", "capture.output", "head", "limitedLabels", "tail")
to your NAMESPACE file (and ensure that your DESCRIPTION Imports field
contains 'methods').