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CRTL, Feature-Test Macros, Selecting a Standard, POSIX C SOURCE==2
 *Conan The Librarian 

    Header files defined by ANSI C make visible those symbols
    required by ISO POSIX-2 plus those required by ISO POSIX-1.

    Standard Selected: ISO POSIX-2

    Other Standards Implied: ISO POSIX-1, ANSI C
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