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This patch fixes the following lintian(1) warning: "Manual page seems to contain a hyphen where a minus sign was intended. '-' chars are interpreted as hyphens (U+2010) by groff, not as minus signs (U+002D). Since options to programs use minus signs (U+002D), this means for example in UTF-8 locales that you cannot cut&paste options, nor search for them easily. '-' must be escaped ('\-') to be interpreted as minus."