Checksum error when updating by delta

[isavaskan]

When I update packages from a custom repo using deltas which are created by pkgdelta, I get "invalid or corrupted package (checksum)" error message.

pacman can download and apply patch. But the checksum of resulted package is different from the original one.

I found a work-around for this problem. If xdelta3 is forced to don't compress/recompress via "-D -R" switches, the problem doesn't occur.