[Haskell-cafe] Build dependency problem with bytestring.

[Don Stewart]

jstrait:
> Hi all,
> 
> I'm upgrading HAppS from my 0.9.2 to the current 0.9.2.1 in Hackage.  
> Some HAppS components have built and installed (IxSet and Util).  
> Halfway through the HAppS-State build, the GHC runtime linker gives a 
> fatal error on finding a duplicate definition for symbol fps_minimum 
> while loading bytestring 0.9.0.4 after having already loaded bytestring 
> 0.9.0.1.  From trial and error, I'm guessing that HAppS-State needs 
> 0.9.0.1 but one of its build dependencies was built with 0.9.0.4.   
> Using GHC 6.8.2 Linux here.
> 
> Any suggestions on how best to currently approach this situation?
> .

you need to uninstall your happs build, uninstall bytestring 0.9.0.1,
and start over, so all packages link against 0.9.0.4 only.

Cheers,
  Don