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    Use the Autoconf macro AC_USE_SYSTEM_EXTENSIONS · 94762e37
    cypherpunks authored and Nick Mathewson's avatar Nick Mathewson committed
    The Autoconf macro AC_USE_SYSTEM_EXTENSIONS defines preprocessor macros
    which turn on extensions to C and POSIX. The macro also makes it easier
    for developers to use the extensions without needing (or forgetting) to
    define them manually.
    The macro can be safely used because it was introduced in Autoconf 2.60
    and Tor requires Autoconf 2.63 and above.