have_library(lib, func = nil, headers = nil, opt = "", &b)
Instance Public methods
Returns whether or not the given entry point func can be found
within lib. If func is nil, the
main() entry point is used by default. If found, it adds the
library to list of libraries to be used when linking your extension.
If headers are provided, it will include those header files as
the header files it looks in when searching for func.
The real name of the library to be linked can be altered by
--with-FOOlib configuration option.
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