AC_LANG_CPLUPLUS shouldn't appear in a defined macro like that. Use AC_LANG_PUSH(C++)/AC_LANG_POP instead. Just in case someone copies the .m4 file (and they're likely to at this point).
Other than that this is right.
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AC_LANG_CPLUPLUS shouldn't appear in a defined macro like that. Use AC_LANG_ PUSH(C+ +)/AC_LANG_ POP instead. Just in case someone copies the .m4 file (and they're likely to at this point).
Other than that this is right.