Then you really should be reporting these problems to that package maintainer. We don’t maintain it and can’t fix problems with it, and the people providing it don’t appear to be active here to see what you post about it …
Your problem isn’t “Kdenlive crashes” - users of the packages we support don’t need to be building frei0r themselves for it to work. And we can’t really help you with “I’m (determined to keep?) using broken packages made by someone else” if you’re happy to ignore red flags like that.