Listed commands BuildKit is dependent on,

and made pojang timestamps better when there's no sha1sum.
Even better pojang signature wwith git-hash-object
Use rsync for copying directories when possible,

or rm -rf previously staged directories for correct staging.
make clean-packages
Added more required/optional dependencies
Supporting dependencies among dependencies
Show all errors in .depends instead of just first
rsync --delete when staging directories
Polished depends checker message
Use intended script arg0 in compiled depends chkr

Using $DEPENDSDIR/script.sh instead of the source location.