Flowdock
method

have_header

Importance_1
have_header(header, preheaders = nil, &b) public

Returns whether or not the given header file can be found on your system. If found, a macro is passed as a preprocessor constant to the compiler using the header file name, in uppercase, prepended with ‘HAVE_’.

For example, if have_header(‘foo.h’) returned true, then the HAVE_FOO_H preprocessor macro would be passed to the compiler.

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