install: ignore -c option for compatibility
@@ -106,6 +106,7 @@ fn parse_opts(args: Vec<String>) -> getopts::Matches {
file", "CONTROL")
// TODO implement flag
.optflag("b", "", "(unimplemented) like --backup but does not accept an argument")
+ .optflag("c", "", "ignored")
// TODO implement flag
.optflag("C", "compare", "(unimplemented) compare each pair of source and destination\n \
files, and in some cases, do not modify the destination at all")
