How do I get ghci to see packages I installed from cabal?

haskell cabal ghci
Dominic Cooney picture Dominic Cooney · Jun 23, 2010 · Viewed 9.8k times · Source

I've installed the such-and-such a package using cabal, and I can build a program that depends on it using cabal build. But when I load the same program in ghci, ghci complains that it "Could not find module `such-and-such'".

I'm surprised this doesn't "just work." How do I tell ghci where to find the packages I've installed with cabal?

Here's my setup: I'm using GHC 6.10.4 on Mac OS X 10.6.3, cabal-install version 0.6.2 using version 1.6.0.3 of the Cabal library.

Answer

Norman Ramsey picture Norman Ramsey · Jun 23, 2010

You need

ghci -package such-and-such

And to double-check that such-and-such is truly visible to GHC, run ghc-pkg list | grep such-and-such.

Related questions

How can I uninstall a version of a Cabal package?

Happstack Lite is breaking on me because it's getting blaze-html version 0.5 and it wants version 0.4. Cabal says that both versions 0.4.3.4 and 0.5.0.0 are installed. I want to remove the 0.5.0.0 and use just the older version. But cabal does not have an "…

Read More
How to install a package using stack?

Using cabal, I could install hakyll with the command: cabal install hakyll How can I do the same thing using stack?

Read More
What is the difference between Cabal and Stack?

Yesterday I learnt about a new Haskell tool called Stack. At the first blush, it looks like it does much the same job as Cabal. So, what is the difference between them? Is stack a replacement for Cabal? In which …

Read More