Can't compile GHC-7.8.3 from git, fails on haskell98 library

[Dr. ERDI Gergo]

On Sun, 2 Nov 2014, Carter Schonwald wrote:

> The checkout clone process for 7.8.3 is very different from head.  What exact commands
> where you trying to do for the initial clone?
> I would use
> Git clone -b ghc-7.8.3 ghcUrl ; ./sync-all get I think. 
> 
> Point being the clone process is different. 

I was on the ghc-7.8.3-release git tag and updated the submodules, so I 
was on the right commit I think. Does 'sync-all get' check out the correct 
commits or at least branches? I think that's the part that what went 
wrong.