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

Rogan Creswick creswick at gmail.com
Thu Jul 3 20:09:54 UTC 2014

On Thu, Jul 3, 2014 at 9:47 AM, Vlatko Basic <vlatko.basic at gmail.com> wrote:

> 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'.

I believe you can use constraints to resolve this.


$ cabal install --only-dep --constraint="snap-server +openssl"

to install snap-server (a dependency) with the openssl flag set.

(Credit to Adam Foltzer for pointing this out to me yesterday,


> 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
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