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This page displays the COHERENT manpage for #ifndef [Include code conditionally].
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#ifndef -- Preprocessing Directive Include code conditionally The preprocessing directive #ifndef checks whether identifier has been defined as a macro name. If identifier has not been defined as a macro, then the preprocessor includes group within the program, up to the next #elif, #else, or #endif directive. If identifier has been defined, however, then group is skipped. An #ifndef directive can be followed by any number of #elif directives, by one #else directive, and by one #elif directive. See Also #elif, #else, #endif, #if, #ifndef, C preprocessor, defined ANSI Standard, §6.8.1