xmlto 0.0.28 fails to build with modern compilers. These issues were fixed in this repository over two years ago but you have not yet released a new version containing these fixes. Please do so.
Hey, Thank you for creating an issue and bringing this to my attention. I will make a release in the following days.
Sorry for the late response. The release was created: https://pagure.io/xmlto/releases.
Metadata Update from @osloup: - Issue status updated to: Closed (was: Open)