How do you install the Haskell Platform over a previous install?

7
votes

I've been working with Haskell lately, and installed gtk2hs (a gtk library for Haskell) a few days ago using MacPorts. For some reason, MacPorts saw fit to install GHC 6.10 over my previous GHC 6.12 install, but I didn't really care.

Now I find myself desiring the improved parallelism support of the latest Haskell Platform, so I installed it today, and it installed successfully - except that when I type in "ghc -v" in Terminal, I am informed that I have GHC 6.10 still.

I have tried using uninstall-hs, and it informs me that I have three Haskells on my system: versions 6.12, 6.12.3, and 7.04. I'm not sure how that 6.12.3 showed up, and what happened to the 6.10? Most importantly, how can I start running version 7.04? Thanks in advance for your help!

2
macoshaskellinstallation

2 Answers

4
votes

You should completely purge your MacPorts install of GHC and your current Platform installation and install the Haskell Platform directly with the OS X installer. After that, future versions of the Haskell Platform can be upgraded to cleanly simply by installing them.

The following command should remove your MacPorts GHC:

$ sudo port uninstall --follow-dependents ghc

You might want to execute something like find /usr /opt/local -name '*ghc*' after uninstalling everything to check that there's no remaining traces.

2
votes

To really clear out the old install, you've got to go in and delete things by hand.

This will be very useful: Everywhere that GHC/Haskell Platform installs

Might want to look here also: http://www.vex.net/~trebla/haskell/sicp.xhtml