[CentOS] Query on make

Greetings,

I have created several scripts which needs to be packaged.

I have done my groundwork on rpmbuild

Let us say I have 4 directories with scripts in them dir1, dir2, dir3 and dir4

I want to create different packages which will contain the compiled code (err.. shc) pack1: dir1,dir2 pack2: dir1,dir3 pack3: dir1,dir3

I want the resulting rpm packages will be residing elsewhere (perhaps BUILDROOT).

Now I am aware of using different specfiles

But When and how do I compile the packages?

Using makefiles? Can it produce different variants?

I am a bit confused as to the workflow.

the sources cannot be part of eithr the srpm or the deliverable rpms.

Please note that this project will be maintained by someone else with unknown familiarity.

Any suggestions, pointers, help etc. please?

Thanks in advance