This macro checks if std::bad_function_call, added in C++11, is defined in the <functional> header.
If it is, define the ax_cv_cxx_have_bad_function_call environment variable to "yes" and define HAVE_CXX_BAD_FUNCTION_CALL.
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Copyright © 2014 Enrico M. Crisostomo firstname.lastname@example.org
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