I just discovered this bug is actually caused by #510629 (arg parsing broken on 64 bits).
The ultimage cause is that mincheader calls dumpfile=`mincexpand $1 $tmpfile -name_only $header_opts` expecting a single line of output. However, the -name_only option is ARGV_CONSTANT and $header_opts may contain -header_only (another ARGV_CONSTANT) causing the -name_only variable to be overwritten back to 0. This prints an extra line containing "Original" or "Temporary". The script mincdiff uses mincexpand and mincheader. -Steve
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