[seL4] mcs kernel compatible with camkes project

Hello all, I wanted to use camkes to create real-time application. In periodic application, it mentioned that "_period" and "_budget" only have affect on the MCS kernel. I tried to build application with kernel version 11.0.0-dev but it doesn't work. I wanted to know how I can have access to MCS kernel that is compatible with camkes project. Thank you, Parvaneh Aghajani.