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"mkdir -p" reports a missing operand, as config/ has no subdirs. Oddly enough this doesn't cause the whole command (and hence the build to fail), despite the "set -e" now covering the entire set of commands - perhaps a quirk of the relatively old bash I've seen this with (a few simple experiments suggest that commands inside () producing a non- success status would exit the inner shell, but not the outer one). Add a dummy . argument to the invocation. Suggested-by: Wei Liu <wei.liu2@citrix.com> Signed-off-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Roger Pau Monné <roger.pau@citrix.com> Reviewed-by: Wei Liu <wei.liu2@citrix.com>