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CRTL, Feature-Test Macros, Selecting a Standard, XOPEN SOURCE EXTENDED
 *Conan The Librarian 

    Makes visible XPG4-extended features, including traditional UNIX
    based interfaces not previously adopted by X/Open.

    Standard Selected: XPG4 V2

    Other Standards Implied: XPG4, ISO POSIX-2, ISO POSIX-1, ANSI C
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