Travis Cardwell wrote:
I wrote an article explaining how I install multiple versions and avoid ~/.cabal hell (on Debian Wheezy):
Thanks for this detailed write up! I have two comments: 1. When you switch to a different version of GHC using the PATH, you also need to take into account the cabal command. Normally you will want to be using the most recent cabal command, but your procedure will switch you over to whatever version of the cabal command was shipped with that version of GHC, because that GHC bin directory now comes first in the PATH. 2. You don't need to have cabal-install installed globally. All you need is the executable. To fix these, add the following to your procedure: 1. Create the directory /usr/local/opt/cabal/bin 2. Create a new empty dir, cd into it, and run: cabal sandbox init; cabal install cabal-install Copy .cabal-sandbox/bin/cabal to /usr/local/opt/cabal/bin [Note: if the cabal bundled with your initial GHC version is too old to support sandboxes, then instead do cabal install cabal-dev; cabal-dev install cabal-install and then copy cabal-dev/bin/cabal to /usr/local/opt/cabal/bin ] 3. Add /usr/local/opt/cabal/bin to your PATH, or install /usr/local/opt/cabal using stow. 4. When you switch to a different version of GHC by setting the PATH, do this instead of what you wrote: export PATH=/usr/local/opt/cabal/bin:/usr/local/opt/ghc-7.6.3-2013.2.0.0/bin:$PATH Regards, Yitz