[Haskell-cafe] Specifying cabal sandbox flag for local package

[Vlatko Basic]

Hello Cafe,

I have a local forked package and added its path to sandboxed project with
  'cabal sandbox add-source PATH'.

However, to build that package I have to specify a flag to 'cabal install'.
In other words I can't install it by
   'cabal install --only-dependencies',
but separately with
   'cabal install PACKAGE -fFLAG'.

Is there a way to tell cabal sandbox (or in project.cabal) to always use some 
flag(s) for compiling a (particular) package in local path?


GHC 7.8.2, Cabal 1.20.0


Best regards,

vlatko