AC_DEFUN([ARABICA_CHECK_CODECVT_SPECIALISATIONS],
[
  if test $wchar_t_available = yes; then
    AC_MSG_CHECKING([for std::codecvt specialisations])
    AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <codecvt>]],
                             [[std::codecvt<char, wchar_t, std::mbstate_t> test;]])],
                    [AS_VAR_SET(codecvt_available, yes)],
                    [AS_VAR_SET(codecvt_available, no)])
    AC_MSG_RESULT($codecvt_available)
    if test $codecvt_available = yes; then
      AC_DEFINE(ARABICA_NO_CODECVT_SPECIALISATIONS, [], [defined if we don't need extra codecvt template specialisations])
    fi
  fi
])