Installing Haskell packages on Mac - macos

Question

I can't seem to get a few Haskell packages to install on my Mac (10.6.8). I first tried Happstack and it failed and then I tried Snap.
Sometimes when I run ghci I get a segmentation fault.
Other times it works and goes like this:
GHCi, version 7.4.2: http://www.haskell.org/ghc/ :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Prelude>
When trying to get Snap:
....
....
....
Loading package vector-0.10.0.1 ... linking ... done.
Loading package zlib-0.5.4.0 ... linking ... done.
Loading package zlib-bindings-0.1.1.3 ... linking ... done.
Loading package zlib-enum-0.2.3 ... linking ... done.
Loading package snap-core-0.9.3.1 ... linking ... done.
Loading package snap-server-0.9.3.3 ... linking ... done.
Loading package directory-tree-0.11.0 ... linking ... done.
cabal: Error: some packages failed to install:
snap-0.11.2 failed during the building phase. The exception was:
ExitFailure 11
I have seen this problem a few times but nothing really solved it for me. Any ideas?

Answer 1

Updated May 22, 2021
Have you tried using homebrew? It handles the dependencies for you.
Using homebrew, you can use the brew command to install ghc and cabal-install.
$ brew install ghc cabal-install
==> Downloading https://ghcr.io/v2/homebrew/core/ghc/manifests/8.10.4
######################################################################## 100.0%
==> Downloading https://ghcr.io/v2/homebrew/core/ghc/blobs/sha256:965f94c14b56e3db7b239860e0a1d577be0b27caf8adb6212710a7430ce723d3
==> Downloading from https://pkg-containers.githubusercontent.com/ghcr1/blobs/sha256:965f94c14b56e3db7b239860e0a1d577be0b27caf8adb6212710a7430ce723d3?se=2021-05-23T05%3A15%3A00Z&sig=fkH7sUY44VCLV8hI%2BtZT%2B
######################################################################## 100.0%
==> Pouring ghc--8.10.4.big_sur.bottle.tar.gz
==> /usr/local/Cellar/ghc/8.10.4/bin/ghc-pkg recache
🍺 /usr/local/Cellar/ghc/8.10.4: 6,907 files, 1.5GB
==> Downloading https://ghcr.io/v2/homebrew/core/cabal-install/manifests/3.4.0.0
######################################################################## 100.0%
==> Downloading https://ghcr.io/v2/homebrew/core/cabal-install/blobs/sha256:2c0c5cc90d4739515721557f8e9c02783b3b5f106033c5c09241657b4418b21f
==> Downloading from https://pkg-containers.githubusercontent.com/ghcr1/blobs/sha256:2c0c5cc90d4739515721557f8e9c02783b3b5f106033c5c09241657b4418b21f?se=2021-05-23T05%3A15%3A00Z&sig=O7ylxHgq42YVADlzTacdRfY7W
######################################################################## 100.0%
==> Pouring cabal-install--3.4.0.0.big_sur.bottle.tar.gz
🍺 /usr/local/Cellar/cabal-install/3.4.0.0: 7 files, 39.6MB
Once installed, you should be able to run:
$ ghc
ghc: no input files
Usage: For basic information, try the `--help' option.
As well as the Haskell interpreter, ghci:
$ ghci
GHCi, version 8.10.4: https://www.haskell.org/ghc/ :? for help
Prelude>
Hope this helps!

Answer 2

brew install haskell-platform is no longer supported. You may want to
Error: No available formula for haskell-platform
We no longer package haskell-platform. Consider installing ghc and cabal-install instead:
brew install ghc cabal-install

Answer 3

Since haskell-platform on homebrew for Mac is deprecated, you can use brew install ghc cabal-install instead. I did it on Yosemite and it took about one minute…
> $ brew install ghc cabal-install
==> Downloading https://homebrew.bintray.com/bottles/ghc-7.10.1_1.yosemite.bottl
######################################################################## 100.0%
==> Pouring ghc-7.10.1_1.yosemite.bottle.tar.gz
🍺 /usr/local/Cellar/ghc/7.10.1_1: 5423 files, 821M
==> Downloading https://homebrew.bintray.com/bottles/cabal-install-1.22.2.0.yose
######################################################################## 100.0%
==> Pouring cabal-install-1.22.2.0.yosemite.bottle.1.tar.gz
==> Caveats
Bash completion has been installed to:
/usr/local/etc/bash_completion.d
==> Summary
🍺 /usr/local/Cellar/cabal-install/1.22.2.0: 6 files, 19M

Answer 4

This is an old question but given it comes quiet high on Google search. This is how I got here.
$ brew update
$ brew install haskell-stack
$ stack --version
$ stack --help # "man stack" gives something completely different
$ stack setup # Install GHC
$ stack ghci
Source: http://seanhess.github.io/2015/08/04/practical-haskell-getting-started.html
Why stack and not cabal?
Edit:
I found annoying to have to write "stack ghci" each time I wanted to use "ghci". A solution to this was to simply add these lines to the ~/.bash_aliases file:
alias sghc='stack ghc'
alias sghci='stack ghci'
alias srunhaskell='stack runhaskell'
Then source the file to apply:
$ source ~/.bash_aliases
Then I can run ghci and / or haskell running these commands, and it will use the stack version:
$ sghc [filename]
$ sghci
$ srunhaskell

Answer 5

Update: February 2016: Whilst other answers were helpful, I didn't find a complete, up-to-date answer.
The install is easy:
$ brew install ghc cabal-install
An extra step I needed to perform post-install was:
$ cabal update
followed by:
$ cabal install ghc-mod
See here for details.
Alternatively, instead of using homebrew for the install, visit Haskell Platform for the installer disk image - note that Haskell Platform is only compatible with OS X 10.6 and later.
Although, as a general rule I always use homebrew to manage my dependencies, when it comes to Haskell my recommendation (unless you really know what you are doing) is to just install this binary. This avoids any surprises further down the road. There is excellent documentation post install locally at: file:///Library/Haskell/doc/start.html
The popular answer to this question (using brew to install haskell-platform) is no longer supported.

Answer 6

Unfortunately, GHC 7.4 isn't supported on OS X 10.6; the download page only has an installer for 10.7, and as you can see, they mean it. I know your problem from bitter experience—I was in exactly your boat for a good long while, and I never found a solution other than upgrading Mac OS X (or, presumably, downgrading GHC, but I didn't really want to do that). A colleague of mine did manage to get 7.4.1 running on OS X 10.5, but it took nontrivial effort on her part (she had to use a different version of GMP, namely 5.0.5, and edit GHC's configure script), and I never tried to replicate it myself.
In the end, you have four options, in roughly decreasing order of simplicity:
Use an older Haskell Platform. This means downgrading to GHC 7.0.x (not GHC 7.2.x—that was never in the Platform); there's not a good record of which GHC versions were in which package versions, though. Wikipedia implies that 2011.2 was the first version with GHC 7.0.x and that 2012.2 was the first version with GHC 7.4.x, so I'd try 2011.4.0.0 first.
Install GHC 7.2 (which is supported on OS X) on its own, and forgo the Haskell Platform. This can cause headaches, but is possible. Don't forget to install Cabal, cabal-install, all the packages that come with the platform, etc.
Upgrade to OS X 10.7 or 10.8, if you feel like a more global (and pricier) change.
Try to replicate what my colleague did. (Best of luck, but it's definitely possible.)

Answer 7

Late 2017 answer. I'm running macOS Sierra -- 10.12.6 (16G29). This worked successfully with an install time on my MacBook Air of under five minutes:
brew cask install haskell-platform
Then ghc --version reported:
The Glorious Glasgow Haskell Compilation System, version 8.2.1