Found the following significant warnings:
  get_subplot_boundary_pixels.cpp:37:10: warning: use of bitwise '|' with boolean operands [-Wbitwise-instead-of-logical]
  polygonize_class.cpp:52:10: warning: use of bitwise '&' with boolean operands [-Wbitwise-instead-of-logical]
  polygonize_class.cpp:78:16: warning: use of bitwise '&' with boolean operands [-Wbitwise-instead-of-logical]
  polygonize_class.cpp:99:11: warning: use of bitwise '|' with boolean operands [-Wbitwise-instead-of-logical]
  polygonize_class.cpp:102:12: warning: use of bitwise '&' with boolean operands [-Wbitwise-instead-of-logical]
See '/home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/APAtree.Rcheck/00install.out' for details.
Found the following significant warnings:
  get_subplot_boundary_pixels.cpp:37:10: warning: use of bitwise '|' with boolean operands [-Wbitwise-instead-of-logical]
  polygonize_class.cpp:52:10: warning: use of bitwise '&' with boolean operands [-Wbitwise-instead-of-logical]
  polygonize_class.cpp:78:16: warning: use of bitwise '&' with boolean operands [-Wbitwise-instead-of-logical]
  polygonize_class.cpp:99:11: warning: use of bitwise '|' with boolean operands [-Wbitwise-instead-of-logical]
  polygonize_class.cpp:102:12: warning: use of bitwise '&' with boolean operands [-Wbitwise-instead-of-logical]
See ‘/data/gannet/ripley/R/packages/tests-clang/APAtree.Rcheck/00install.out’ for details.