[Haskell-cafe] Cabal: disabling -fvia-C

[Jacek Generowicz]

I hope you will pardon another *ignorant* question.

'cabal install lambdabot' fails on Ubuntu Natty.

According to the following exchange and bug report

     http://comments.gmane.org/gmane.comp.lang.haskell.cafe/88735

     http://hackage.haskell.org/trac/ghc/ticket/5050

the workaround is not to use -fvia-C.

I have found an {-# OPTION -fvia-C #-} deep inside the lambdabot code  
in Plugin/Pl/Common.hs. How can I tell cabal install to ignore this?  
Is there some command line option for doing so, or do I have to edit  
the source code and somehow persuade cabal to use my hacked version ?