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I misused the AC_CHECK_DECL macro, assuming that it behaved like AC_CHECK_DECLS and always defined a HAVE_xxx macro if the decl was found. Instead, the [action-if-found] shell commands are needed to defined HAVE_O_NONBLOCK explicitly. libstdc++-v3/ChangeLog: * configure.ac: Fix check for O_NONBLOCK. * config.h.in: Regenerate. * configure: Regenerate.
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