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/usr/share/dune/aclocal/cxx0x_nullptr.m4 is in libdune-common-dev 2.3.1-1.

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AC_DEFUN([NULLPTR_CHECK],[
  AC_CACHE_CHECK([whether nullptr is supported], dune_cv_nullptr_support, [
    AC_REQUIRE([AC_PROG_CXX])
    AC_REQUIRE([GXX0X])
    AC_LANG_PUSH([C++])
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
      [],[[
      char* ch = nullptr;
      if(ch!=nullptr) { ; }
      ]])],
      dune_cv_nullptr_support=yes,
      dune_cv_nullptr_support=no)
    AC_LANG_POP
  ])
  if test "x$dune_cv_nullptr_support" = xyes; then
    AC_DEFINE(HAVE_NULLPTR, 1, [Define to 1 if nullptr is supported])
  fi
])