Adding modules to the hat libraries

I'm trying to get QuickCheck added to the available hat modules...

So... I've added the source file at src/hatlibs/Test/QuickCheck.hs,  
I've modified src/hatlibs/Makefile to tell it to build the file, I've  
modified configure to make it install the .hx file... I've edited the  
src/hatlibs/hat.pkgconf and src/hatlibs/hat.cabal files to make ghc's  
package system make sense, I can't for the life of me figure out what  
to edit to tell it to install the .hi file!

What do I need to do?

Bob