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CRTL, Feature-Test Macros, Selecting a Standard, POSIX C SOURCE==199506
 *Conan The Librarian 

    Header files defined by ANSI C make visible those symbols
    required by IEEE 1003.1c-1995.

    Standard Selected: IEEE 1003.1c-1995

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