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It is common that build hosts are isolated from outside world. They don't necessarily have wget or ftp installed. Turn the error into warning in configure. And point FETCHER to `false' command if neither wget nor ftp is available, so any attempt to download will result in error. Signed-off-by: Wei Liu <wei.liu2@citrix.com> Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>