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InstallHaskell.md

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Installing a Haskell development environment

Ubuntu

haskell-platform 2013.2

The easiest way is to install the latest haskell-platform package from you distribution's standard package manager. For Ubuntu 14.04 and 14.10 that would give you haskell-platform 2013.2 including the compiler ghc-7.6.3 and cabal-install version 1.20.0.3.

sudo apt-get install haskell-platform

haskell-platform 2014.2

To get version 2014-2 (which I recommend for the AFP course), you need to activate another package archive for ghc, then install cabal-install and ghc from this ppa, followed by alex and happy using cabal. (Instructions copied from stackage.)

sudo apt-get update
sudo apt-get install -y software-properties-common
sudo add-apt-repository -y ppa:hvr/ghc
sudo apt-get update
sudo apt-get install -y cabal-install-1.20 ghc-7.8.4
cat >> ~/.bashrc <<EOF
export PATH=~/.cabal/bin:/opt/cabal/1.20/bin:/opt/ghc/7.8.4/bin:$PATH
EOF
export PATH=~/.cabal/bin:/opt/cabal/1.20/bin:/opt/ghc/7.8.4/bin:$PATH
cabal update
cabal install alex happy

To avoid confusion with different versions of packages I recommend you to instruct cabal to use stackage LTS Haskell 1.2:

cd .cabal
wget 'http://www.stackage.org/snapshot/lts-1.2/cabal.config?global=true' -O cabal.global.config
mv config config.old
cat config.old cabal.global.config > config
cabal update

Cabal will the point out that cabal-install in LTS Haskell 1.2 has a slightly newer version than in the ppa. So if you want you can update (but that requires another ubuntu package):

sudo apt-get install zlib1g-dev
cabal install cabal-install

You can check your versions as follows:

patrikj@etyd:~$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 7.8.4
patrikj@etyd:~$ cabal --version
cabal-install version 1.18.0.8
using version 1.18.1.5 of the Cabal library

Mac OS X

(This approach is tested on OS X 10.8 Mountain Lion (I know, I know, I really should update soon...), YMMV.)

haskell-platform 2014.2

I generally like the packet manager Homebrew, but it doesn't always play very nice with the Haskell platform, so my advice is to get the installer from here: https://www.haskell.org/platform/mac.html The rest should be more or less analogous to the Linux instructions, but please add anything else you may encounter. (I didn't do this now, so I don't remember all the details. I only wrote this because I know that homebrew can cause issues and because of the issue with HGL and X11 below.)

Issue with HGL/X11

When trying to install HGL (the graphics library recommended in lab 1) by doing cabal install hgl , cabal fails to install the dependency X11 due to the following error: ld: library not found for -lXss.

The solution for this is to run the command LIBRARY_PATH=/opt/X11/lib:$LIBRARY_PATH cabal install X11 or, if that doesn't work, LIBRARY_PATH=/opt/X11/lib:$LIBRARY_PATH CPPFLAGS="-I/opt/X11/include" LDFLAGS="-L/opt/X11/lib" cabal install X11. After this, HGL should install just fine. (Solution found here.)

FreeBSD

(Tested on FreeBSD 10.1-RELEASE)

haskell-platform 2014.2

# pkg install hs-haskell-platform
$ cabal update
$ cabal install alex happy

The procedure for telling cabal to use stackage LTS Haskell 1.2 is the same as the Ubuntu instructions above. Then comment/uncomment the appropriate remote-repo lines in the config file you just cat:ed together, make sure your shell can find the binaries in ~/.cabal/bin, and run:

$ cabal update
$ cabal install cabal-install

This gives us

$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 7.8.3
$ cabal --version
cabal-install version 1.18.0.8
using version 1.18.1.3 of the Cabal library