Can not use OBS to build centos kernel

Hi, all I use OBS to build CentOS8 kernel, but it is unresolvable. The link is : https://build.openbuildservice.org/package/show/home:wanglong:kernel/kernel The build can not begin, because required packages are either missing or not explicitly defined. unresolvable: nothing provides python3-devel, nothing provides python3-docutils, nothing provides llvm-toolset does anyone has ideas or solutions to fix it? thanks.