How do I add new dependencies and source files into the build system?

[Colin Paul Adams]

I have added a subdirectory named verify to the compiler directory,
and made a change to simplCore to call functions from it.

I have managed to get it to compile by editing ghc.cabal in the
compiler directory (after some problems with cabal which are now
sorted). But I think this is not the correct way to do it, as
./configure rebuilds this file, it seems.

Where should I be doing this?
-- 
Colin Adams
Preston Lancashire