Hey @sergey-safarov,
This is due to a misssing package called `docbook-xsl`. Hopefully, it's available on your OS as well.
@miconda After [2692148](https://github.com/kamailio/kamailio/commit/2692148d92bb8b17709eb4cbddd8e653...), this should be the behavior.
`make install` we now install the README found in `src/modules/*/README` in the `share` folder.
Do you have the need to build the readmes in the end? As we discussed above, install should copy the ones found in each module .