-a5, --add-md5 - add md5 comments to URL sources, implies -nc -nd -ncs
-n5, --no-md5 - ignore md5 comments in spec
-D, --debug - enable builder script debugging mode,
-a5, --add-md5 - add md5 comments to URL sources, implies -nc -nd -ncs
-n5, --no-md5 - ignore md5 comments in spec
-D, --debug - enable builder script debugging mode,