# if defined (_MSC_VER) && (_MSC_FULL_VER >= 140050000)
// Checked iterators are currently only supported in MSVC++ 8 or better.
#  include <iterator>
# endif  /* _MSC_VER >= 1400 */

# if defined (_MSC_VER) && (_MSC_FULL_VER >= 140050000)
template <typename PTR>
stdext::checked_array_iterator<PTR>
ACE_make_checked_array_iterator (PTR buf, size_t len)
{
return stdext::checked_array_iterator (buf, len);
}
# else
template <typename PTR>
PTR
ACE_make_checked_array_iterator (PTR buf, size_t /* len */)
{
// Checked iterators are unsupported.  Just return the pointer to
// the buffer itself.
return buf;
}
# endif  /* _MSC_VER >= 1400 */

#endif  /* ACE_CHECKED_ITERATOR_H */

I need to develop a solution to it.  The easiest way to find a solution is to use some macro explicitly set by the STLport header, which is not set by any other STL libraries.  I chose to use the _STLP_ITERATOR macro set by “stl/stlport/iterator” header.

#ifndef _STLP_ITERATOR
#define _STLP_ITERATOR

# ifndef _STLP_OUTERMOST_HEADER_ID
#  define _STLP_OUTERMOST_HEADER_ID 0×38
#  include <stl/_prolog.h>
# endif

# ifdef _STLP_PRAGMA_ONCE
#  pragma once
# endif

#if defined (_STLP_IMPORT_VENDOR_STD)
# include _STLP_NATIVE_HEADER(iterator)
#endif /* IMPORT */

# ifndef _STLP_INTERNAL_ITERATOR_H
#  include <stl/_iterator.h>
# endif

# ifndef _STLP_INTERNAL_STREAM_ITERATOR_H
#  include <stl/_stream_iterator.h>
# endif

# if (_STLP_OUTERMOST_HEADER_ID == 0×38)
#  include <stl/_epilog.h>
#  undef _STLP_OUTERMOST_HEADER_ID
# endif

#endif /* _STLP_ITERATOR */

The solution is the following, where I have added the !defined(_STLP_ITERATOR) condition along with the check for Visual Studio compiler version.

# if !defined(_STLP_ITERATOR) && defined (_MSC_VER) && (_MSC_FULL_VER >= 140050000)
// Checked iterators are currently only supported in MSVC++ 8 or better.
#  include <iterator>
# endif  /* _MSC_VER >= 1400 */

# if defined (_MSC_VER) && (_MSC_FULL_VER >= 140050000)
template <typename PTR>
stdext::checked_array_iterator <PTR>
ACE_make_checked_array_iterator (PTR buf, size_t len)
{
return stdext::checked_array_iterator (buf, len);
}
# else
template <typename PTR>
PTR
ACE_make_checked_array_iterator (PTR buf, size_t /* len */)
{
// Checked iterators are unsupported. Just return the pointer to
// the buffer itself.
return buf;
}
#
endif  /* _MSC_VER >= 1400 */

#endif
/* ACE_CHECKED_ITERATOR_H */