MKVToolNix 20.0 is an important release that comes with major changes at code and functionality end. These include the removal of numerous deprecated functions, implementation of the cmark library as a new requirement for package maintainers, and the complete rewrite of mkvinfo’s internals. In regards to the new cmark dependency, the developer noted the fact that GNU/Linux distributions must contain the cmark-devel package, which is available in RPM-based distros like Fedora, OpenSuSE, and CentOS, but not in Debian or Ubuntu. MKVToolNix needs both the cmark library and its headers.