method

have_header

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have_header(header, preheaders = nil, opt = "", &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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# File lib/mkmf.rb, line 1093
  def have_header(header, preheaders = nil, opt = "", &b)
    checking_for header do
      if try_header(cpp_include(preheaders)+cpp_include(header), opt, &b)
        $defs.push(format("-DHAVE_%s", header.tr_cpp))
        true
      else
        false
      end
    end
  end

have_header

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