have_header

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.

Links:

https://github.com/ruby/ruby/blob/5b37cb25ec6c4faeb0296cad1fbe48a9d7c3a56a/lib/mkmf.rb#L1035

doc_ruby_on_rails

2015-04-17 22:15:37

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