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The C++98-style concept check for output iterators causes a link failure on mingw-w64, because the __val() member function isn't defined. Change it to use a function pointer instead. That pointer is never set to anything meaningful, but it doesn't matter as the __constraints() function only has to be instantiated, it's never called. We could refactor all of these to use unevaluated contexts (e.g. sizeof of __decltype) so that we only check the expressions are well-formed, without any codegen at all. Any improvements to these are very low priority though. libstdc++-v3/ChangeLog: * include/bits/boost_concept_check.h (_OutputIteratorConcept): Change member function to data member of function pointer type.