'library' or 'require' calls in package code:
  'mgcv' 'rgl' 'tcltk'
  Please use :: or requireNamespace() instead.
  See section 'Suggested packages' in the 'Writing R Extensions' manual.
‘library’ or ‘require’ calls in package code:
  ‘mgcv’ ‘rgl’ ‘tcltk’
  Please use :: or requireNamespace() instead.
  See section 'Suggested packages' in the 'Writing R Extensions' manual.
'library' or 'require' calls in package code:
  ‘mgcv’ ‘rgl’ ‘tcltk’
  Please use :: or requireNamespace() instead.
  See section 'Suggested packages' in the 'Writing R Extensions' manual.
'library' or 'require' calls in package code:
  ‘mgcv’ ‘rgl’ ‘tcltk’
  Please use :: or requireNamespace() instead.
  See section 'Suggested packages' in the 'Writing R Extensions' manual.
'library' or 'require' calls in package code:
  'mgcv' 'rgl' 'tcltk'
  Please use :: or requireNamespace() instead.
  See section 'Suggested packages' in the 'Writing R Extensions' manual.
‘library’ or ‘require’ calls in package code:
  ‘mgcv’ ‘rgl’ ‘tcltk’
  Please use :: or requireNamespace() instead.
  See section 'Suggested packages' in the 'Writing R Extensions' manual.
‘library’ or ‘require’ calls in package code:
  ‘mgcv’ ‘rgl’ ‘tcltk’
  Please use :: or requireNamespace() instead.
  See section 'Suggested packages' in the 'Writing R Extensions' manual.
'library' or 'require' calls in package code:
  ‘mgcv’ ‘rgl’ ‘tcltk’
  Please use :: or requireNamespace() instead.
  See section 'Suggested packages' in the 'Writing R Extensions' manual.
'library' or 'require' calls in package code:
  ‘mgcv’ ‘rgl’ ‘tcltk’
  Please use :: or requireNamespace() instead.
  See section 'Suggested packages' in the 'Writing R Extensions' manual.
'library' or 'require' calls in package code:
  'mgcv' 'rgl' 'tcltk'
  Please use :: or requireNamespace() instead.
  See section 'Suggested packages' in the 'Writing R Extensions' manual.
'library' or 'require' calls in package code:
  ‘mgcv’ ‘rgl’ ‘tcltk’
  Please use :: or requireNamespace() instead.
  See section 'Suggested packages' in the 'Writing R Extensions' manual.
'library' or 'require' calls in package code:
  ‘mgcv’ ‘rgl’ ‘tcltk’
  Please use :: or requireNamespace() instead.
  See section 'Suggested packages' in the 'Writing R Extensions' manual.
'library' or 'require' calls in package code:
  'mgcv' 'rgl' 'tcltk'
  Please use :: or requireNamespace() instead.
  See section 'Suggested packages' in the 'Writing R Extensions' manual.