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AC_CHECK_DECLS defines HAVE_DECL_ARC4RANDOM_BUF to 0 or 1. On Windows this isn't defined to 0. To avoid the undefined state, the AC_CHECK_DECL is used to manually define the HAVE_ARC4RANDOM_BUF to 1 if declaration is found, otherwise undefined. In the future on current platforms, also AC_CHECK_FUNCS can be used instead since the arc4random_buf is located in default libraries (C) with declaration available in headers.