Cran NOTE

Result: NOTE 
  File ‘TreeDist/libs/TreeDist.so’:
    Found non-API call to R: ‘ATTRIB’
  
  Compiled code should not call non-API entry points in R.
  
  See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual,
  and section ‘Moving into C API compliance’ for issues with the use of
  non-API entry points.