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This macro checks if std::hash, added in C++11, is defined in the <functional> header.
If it is, define the ax_cv_cxx_have_hash environment variable to "yes" and define HAVE_CXX_HASH.
Download the latest version of ax_cxx_have_hash.m4 or browse the macro’s revision history.
Copyright © 2014 Enrico M. Crisostomo firstname.lastname@example.org
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