Can not compile kernel modules for RocketRaid 640L

Manjaro uses systemd - and therefore /etc/init.d does not exist - and the expectations from certain actions carried out by init will not be present - which may cause other failures at a later point.

I suggest you take a look at the custom build scripts in Arch User Repo

Possibly one of the -dkms packages but you will have to inspect them to judge what is valid for your system.