Re: [Haskell-cafe] How to direct cabal to use an alternative ghc version, ala stack?

Thanks to all, whom replied. I found that a simple “stack install …” worked perfectly, as an alternative to “cabal install ...". Stack seems to have honored all the “cabal …” things I did in setting up my sandbox, including all my “cabal sandbox —add-source …” commands (5 in all). And, of course, it used the back-rev’d version of ghc I configured it (i.e. - stack) for. That is SO neat that I can’t understand why it’s not a featured item in the Stack documentation. Thanks, Stack crew! -db On Sep 2, 2015, at 8:59 PM, Michael Snoyman wrote:

On Thu, Sep 3, 2015 at 3:37 AM, David Banas wrote: Hi all,

How do I direct cabal to use an alternative (i.e. - not my system’s default) version of ghc, which I’ve installed, via stack?

I tried this:

stack exec cabal install ...

but got this:

cabal: Use of GHC's environment variable GHC_PACKAGE_PATH is incompatible with Cabal. Use the flag --package-db to specify a package database (it can be used multiple times).

Thanks, -db

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We have a flag to working better with cabal, you can try:

stack exec --no-ghc-package-path -- cabal install

I'm under the impression that there are changes planned to cabal (possibly already implemented but not released) that will allow it to function nicely with the GHC_PACKAGE_PATH environment variable, but I'm uncertain if that's true.

Michael