have_header(header, preheaders = nil, opt = "", &b)
Instance Public methods
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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