Source archive is missing top-level directory
$ tar -t --xz -f datovka-4.1.0-src.tar.xz | head
.gitignore
AUTHORS
COPYING
ChangeLog
INSTALL
Makefile.am
NEWS
README
datovka.pro
deployment/
This not how good source archive should look like. To make your source more attractive for Linux distributions, please put everything inside datovka-4.1.0 directory.